Hi darrylb.
Welcome to our Mattress Forum. 
I am sorry to hear of your discomfort on your Purple Mattress.
There are many fans of the older Simmons Beauty Rest mattresses! Their more “traditional” construction of a quilted top innerspring mattress was popular in the old days. Do. you happen to remember which model of Beauty Rest it was? I would be interested to see if we can find the layer specifications.
Just for the sake of reference … the materials in the Tempurpedic Breeze are as follows …
Quilt
Tempur-Breeze & Microsuede
100% Polyester
Comfort / transition Layers
2" TEMPUR-ES comfort layer 4.1 LB
2" TEMPUR Support Layer 5.3 LB
Support System Polyfoam core (Dual Airflow System)
3.5" Airflow Baselayer 2.2lb
3.5" Airflow Baselayer 2.2lb
While this mattress would not have any weak links in terms of durability for you and your wife’s BMI, compared to many mattresses made by smaller manufacturers … there is nothing special about this Tempurpedic line outside of their name recognition and the amount of advertising they do. You can see some of my general thoughts about Tempurpedic in post #10 here and the posts it links to and while for the most part they do use good quality materials … for most people they certainly wouldn’t be in the best value range compared to many other similar mattresses that use the same or similar quality materials (or sometimes better quality) and are in much lower price ranges.
The most important part of the value of a mattress purchase is durability (which is all about how long you will sleep well) and in terms of durability, a mattress is only as good as its construction and the quality and durability of the materials inside it regardless of the name of the manufacturer on the label.
As you are both side sleepers, a good starting point for a good comfort layer for is 3" and then depending on weight, body shape, preferences, and the firmness of the support layers, to go up or down from there. Most side sleepers will fall in the range of from 2" - 4". And because you are both within a BMI of 20 - 30 II assume this is true of your wife, since I don’t know her weight) and are considering mattresses with poly or memory foam in the comfort layers, I would keep these recommendations in mind:
- Polyurethane foam (often called polyfoam): If your mattress is one-sided then I would make sure that the density of any polyfoam is at least 1.8 lb per cubic foot or higher. If the mattress is two-sided then I would use a minimum foam density of 1.5 lbs per cubic foot or higher.
- Memory foam (or gel memory foam): If your mattress is one-sided then I would make sure that any memory foam is at least 4 lb per cubic foot. If the mattress is two-sided then I would use a minimum density of 3 lbs per cubic foot.
I always have a hard time pointing people in the right direction because definitions of soft and firm can very so much, especially in regards to support. Firmness and support really aren’t as tied together as it may seem. For example, there are foams that that very soft (between 10-16 IFD) but actually have higher support than foams with higher IFDs.
Additionally, comparing the softness/firmness of a mattress you might consider with another mattress on the market no matter how widely available might be is no possible (except in general terms) because a mattress wok as a whole and in combination with the individuals sleeping on the.
So, I’d say a firmness rating scale is unreliable at worst and at best only possible as an internal way to compare mattresses made by the same company or/and … tested by the same individuals. To give you a quick example someone with an “hour-glass” and very curvy body profile which are also is sleeping on their side might have trouble with most mattresses even in soft configuration. You can see this 3-page more extreme alignment/pressure points real case scenario we currently have in progress to give you an idea of how different the perception of softness/firmness can be from person to person
As you are considering a GhostBed, I would suggest reaching out to or visiting them so they can help with making the best comfort/support choice. If they are given your stats and information about your body types, sleeping styles, general preferences and history, some general information about mattresses you have tested and done well with, and any other specific information or circumstances that could affect your choice of a mattress, they’ll be able to help guide you.
As you mentioned that you slept hot on all toppers you purchased (which I suspect were memory foam variations) you may wish to consider a mattress that has latex in the comfort layer as it tends to sleep the coolest of all the foams and offers the “plush” feel that many desire while offering secondary support and reducing pressure points.
Additionally, I am not sure if you came across some of our posts that discuss temperature regulations issues, but you can read more about the many variables that can affect the sleeping temperature of a mattress or sleeping system in post #2 here more about tracking mattress temperature regulation issues potential causes ~ Post #2 here (at least to the degree possible for a specific mattress) and the posts it links to that may be helpful. You may also be interested in the information in post #29 about temperature regulation and mattress microclimate.
As far as warranties go, they only cover defects in a mattress which are generally defined as visible impressions that are more than a specified amount when there is no weight on the mattress (normally from .75" to 2") and don’t cover changes in the firmness of the materials and the loss of comfort and support which is the biggest reason that you will need to replace a mattress. This I would put more stock in the return/trial policies of any company you may be considering.
Fox Mattress specializes in sleeping cool as well as temperature and humidity regulation, and they offer latex (amongst other) options. They are located about 90 minutes away from where you are.
GhostBed has a showroom about 3 hours from you, but doesn’t offer latex…but you would be able to test their mattresses in person which is a plus.
There is no shortcut to doing this fast and ensuring the mattress is a good fit. The good news is that if you do it right then you don’t have to worry about it for the next decade or even more. I know it isn’t quite that straight forward and “linear” to select a mattress. There is a lot of contradictory and confusing information. I would step back a bit and would not add more mattresses to your list. it is easy to get into an impulse shopping mode and select something based on cleverly crafted advertising verbiage. and first, try to understand a bit more your needs and preferences. I am saying this as I am noticing that you selected a very wide range of mattress types and materials. Once you determine what type of mattress and materials you prefer and need you can use new criteria to eliminate and narrow your mattress search based on these criteria. Then you can apply a second and very important criteria of “durability” … eliminate all mattresses that do not meet the durability guidelines for my BMI … then a third “temperature regulation” e.g. eliminate all mattresses that have the potential to sleep hot… and so on. But that is all covered in the tutorial post here which has all the basic information, steps, and guidelines you will need to make the best possible choices … and know how and why to avoid the worst ones which would include the major brands such as Serta or any mattress where you aren’t able to find out the quality of the materials inside it. When assessing any product, also be sure that you find out information listed here so you can compare the quality of the materials and components to the durability guidelines here to make sure there are no lower quality materials or weak links in a mattress that would be a cause for concern relative to the durability and useful life of a mattress before making any purchase.
I hope this helps you as you continue in your research. I look forward to progress reports or future questions
Phoenix.