Hi briank,
Wow … that’s a lot to cover 
First of all re Tempurpedic … in a nutshell they are a high quality mattress that IMO is also significantly overpriced. There was a time when they were really the only high quality memory foam mattress but those days are long past and other foam manufacturers have since caught up and in some ways surpassed tempurpedic but at much lower prices. A forum search on Tempurpedic will give you a great deal of information about them and memory foam in general. There is also an article on the pros and cons of memory foam here … although this is generic and not about Tempurpedic in particular.
While there’s no way to know how you may sleep on any particular mattress … I can tell you that memory foam in general is a hotter sleeping material than either polyurethane foam (the more typical foams you find in a mattress) or latex foam which is the coolest foam of the three categories. Having said this there is an amazingly wide variety of different types of memory foam that use different methods to offset heat. These include memory foams with more open cells, holes punched in the foam, air channels under the foam (which IMO is questionable by itself), and additions to the memory foam such as gel, some of which are cooler than others. Part of the reason for how hot they sleep is that you will tend to sink more deeply into memory foam than other materials … especially if the memory foam layers are as thick as you are mentioning … and the deeper you sink into any foam the hotter it will tend to be but this is most true with memory foam. Memory foam also tends to have a less open cell structure than other foams so is more “insulating”. tempurpedic in most people’s perceptions and experience is on the warmer end of the scale.
There are quite a few things that can be done to offset this such as a mattress pad or topper, different types of mattress tickings that are more breathable and help offset heat, and of course different bedding materials including cooler sheets such as linen instead of synthetics and different blankets. Overall though as a group … memory foams are hotter than other foams.
Hotel beds are often a “love them” or “hate them” experience and if you purchase one it rarely translates into the same kind of comfort in the long term. While there are many different types of hotel beds … they tend to have very thick layers of polyurethane in the comfort layers over a good innerspring and can be a recipe for body impressions … especially with a pillowtop version. They are often made by Serta or Simmons and are basically a variation on one of their “regular” lineup … except the value is typically less. I would definitely tend to avoid these partly because of the materials used and partly because they tend to be very poor value.
There are many mattresses that are comparable to Tempurpedic but they aren’t a specific brand but a model that may be made by a particular manufacturer that feels similar to you. To get close you would go to the Tempurpedic website and look at the layering and the density of the foam in the specific model you liked and then look for a mattress with similar layering and similar foam densities. You would also need the knowledge to ask all the right questions about the type of memory foam in the mattress you were comparing. Post #9 here talks about the many variables involved with memory foam and why any memory foam mattress is difficult to duplicate. It’s usually not worth the effort anyway when it is very unlikely that the model you are using as a reference is really the absolute best choice for you anyway of all the memory foam mattresses available or is the most comfortable and suitable for you. You would be limiting your choices to something that feels like a Tempurpedic when there may be may mattress that feel much better to you that you haven’t tried. Having said that … many manufacturers will have a good sense of which of the memory foam models they make will feel similar (at least to some people) to a specific Tempurpedic.
In general … subjective ideas or perceptions of comfort are the worst way to buy a mattress and is the most common “mistake” reason for disappointment after the purchase. It is also the most certain way to overpay for a mattress because the cheapest materials can be very comfortable in a showroom and for a little while after you buy them … until they lose the qualities that you bought them for. Many mattress salespeople are highly trained in how to “manage” subjective perceptions in a showroom and use this to “show” you that more expensive mattresses are more “comfortable”. What feels good based the managed perceptions of short term comfort in a showroom will often not translate into healthy sleep and long term comfort in nightly use.
Healthy sleeping is the most comfortable in the long term and to have this you need to test a mattress for PPP (Pressure relief, Posture and alignment, and Preferences). Pressure relief, posture, and the preferences that lead to a good sleeping microclimate and temperature control, a “feel” you like, and other variables including durability that are more or less important to each person that are a side effect of the materials used in a mattress are the way to buy a mattress. Better outlets understand this and will help guide you in all of this and explain the properties of different materials that provide them.
Latex is an amazingly versatile material and one of the highest quality mattress materials but like with all things … it’s not everyone’s favorite. There are also many varieties of latex mattresses as well … either all latex, latex over innersprings, or latex over polyfoam … as well as many other variations and combinations with other materials such as memory foam.
While there are too many factors involved in mattress construction to give a ballpark price range for all latex mattresses, it would be reasonable to expect that in a queen you could would have some good choices in high quality “all latex” mattress (mattress only) for under $2000 and in some cases for under $1500. Some will be much more (and worth it) depending on many factors. Part latex mattresses (with say 2-3" or so of latex over a polyfoam core) will generally start under about $800 and go up from there. Factors such as the amount and type of latex in the mattress, other materials or components in the mattress, the type of support system, the type of quilting and ticking used, whether it is one or two sided, and various construction methods or extra features will all play a role in the final price of a mattress. While you could “beat” these general prices in some cases … I also wouldn’t exclude mattresses that were more depending on the mattress and how well it “fit” your needs and preferences.
Some of the more local options that are reasonably near Belleville, MI. that carry latex include …
https://www.matt-to-go.com/Brands_We_Carry.html Shelby township. Retail outlet that is run by one of the most knowledgeable “mattress people” in the industry. He has als produced a series of videos that are very educational about mattress construction. They carry Therapedic mattresses which includes latex models and latex/memory foam hybrids and the Pure Latex Bliss which makes talalay latex mattresses. They provide great service and guidance to their customers and are also a member of this site.
http://www.bannermattress.com/ Toledo. Local factory direct manufacturer which maked a range of mattresses including latex, memory foam, and traditional innersprings.
http://www.sanitarymattress.com/map.htm Saginaw. Local factory direct manufacturer. A “mom and pop” business that makes several types of mattresses including latex.
Furniture Row® Store Locations - Store Hours & Addresses Toledo. Regional factory direct manufacturer which makes traditional innerspring mattresses and also has two “mostly latex” models. Doesn’t make any specialty memory foam mattresses and I would also avoid the major brands they also carry and stick to their own mattresses.
http://www.downtoearthhome.com/ Farmington Hills. A retail outlet that carries some high quality Dunlop Latex mattresses, latex/innerspring hybrids, as well as “no foam” mattresses and vegan models that have no fire retardant (not even wool) and are available with a prescription. Their prices are very reasonable (similar to factory directs) and when I talked with them I was quite impressed.
http://www.michigandiscountmattress.com/ Farmington Hills, MI. Retail outlet. I have talked with Eric here and he carries several brands which may have some better value and includes latex and memory foam. These include Restonic, Nature’s Sleep, Corsicana, and Symbol. He is committed to providing his customers with the best quality/value he can put on his floor and is “good people”.
http://herronsfurniture.com/about-us Napoleon. Retail outlet that carries a large lineup of what appear to be higher quality mattresses that are “Amish made”. I haven’t talked with them so I can’t speak to their value but for those who are close enough they would be well worth a phone call and possible a visit.
http://www.tricountymattressfactory.com/ Westland. Retail outlet. Carry Englander mattressses which make Dunlop latex mattresses as well as various other types of mattress but there is no information on the site about which models they carry.
http://www.harrysfurniture.net/HomePage.aspx Saline. Retail outlet. They carry Restonic mattresses which makes an all latex mattress in their Helathrest line but in some areas they also use several inches of polyfoam above the latex.
Hopefully this will give you lots of choices to test latex. I would definitely call them first both to get a sense of their overall approach and to make sure they carry either “all latex” mattresses or “part latex mattresses” so you know what to expect when you visit them.
Hope this helps.
Phoenix