I’m a little surprised that Magic Sleeper didn’t know more details of their mattresses. When I talked with John last they were also making an all latex mattress that used 3" of talalay latex over 6" of Dunlop and had very good value. I’ll have to call them to catch up on what they are currently carrying in terms of both their own mattresses and the other brands they carry. It’s possible that you were dealing with someone there that was less knowledgeable but I would tend to focus on either the mattresses they make themselves or at least on any of the others that they can provide the details of every layer and have comparable value. With any mattress purchase … the most important part to determine quality and durability is knowing the details of what is inside the mattress.
NOTE ADDED: They are now a member of this site. They have changed their lineup since this post and I would consider any of the mattresses they make. They are now only using knowledgeable and experienced family members to staff their showroom.
There are partial specs of the Symbol G-Gel memory foam mattresses here but they don’t list the density of the memory foams that they use. It shouldn’t be that difficult for a retail outlet to find out though.
5 lb Sensus memory foam is a slower response and denser memory foam with a more “traditional” memory foam feel and a wider temperature response while the 4 lb Aerus is a more breathable faster response memory foam and a little less temperature responsive.
All of your listed choices are very good ones but as you know are also very different.
I would suggest first choosing which you prefer between the feel of memory foam or latex in the comfort layers based on your research into the qualities of both and your local testing. If you’re not certain … I would probably do a little more local testing. As you know they are very different and the choice would come down to your preferences and whether you prefer the more dead and “in the mattress” feel of memory foam or the more lively and “on the mattress” feel of latex.
I would then suggest talking to each of them and asking your questions and if you can describe the feel you like and the mattresses you have tried that were “close”, they will also give you their suggestions about which mattress they think would best suit your needs and preferences (within the limits of their designs) based on customers that were similar to you. They all have a large customer base and are most familiar with the specific details of the mattresses they make and are in the best position to give recommendations about which may fit your needs and preferences best. The more specific you can be with any local testing you have done and what you prefer, the more it can help them make good suggestions. Without this they would generally recommend what an “average” person of your height and weight and sleeping positions would generally do best with in the material that you prefer.
Some of the better local choices or possibilities in the area (I’m including Magic Sleeper where you have already been) include …
http://www.magicsleeper.net/ and http://www.mattressandfurniturestore.com/ Pottstown (or Pottsdown), PA. Local factory direct manufacturer that makes a range of good quality and value mattresses including two sided innerspring mattresses and a number of latex and latex hybrid options. Family owned and good people. They also make custom designs and sizes and and they are also a member of this site.
Furniture Row® Store Locations - Store Hours & Addresses York, PA Regional manufacturer which makes a range of traditional innerspring mattresses and also makes two “mostly latex” models (Aspen and Snowmass). They don’t make any memory foam. EDIT: The Aspen and Snowmass have been replaced with their iChoice latex mattress and topper which also includes a memory foam option)
http://www.wolffurniture.com/current/stores/wolf_furniture_stores.aspx Local retailer with several stores in the area. Carries Restonic which makes latex, memory foam, and gel foam mattresses in their Healthrest line. I would call first to find out which they carry.
http://gardnersmattressandmore.com/ Retail outlet in Lancaster, PA. They carry a wide range of manufacturers including Pure Talalay Bliss, Posh & Lavish, Pranasleep, Organicpedic (OMI), Naturepedic, Savvy Rest component latex mattresses as well as Vi Spring and Hypnos which are more “ultra premium” brands. While all of these manufacturers generally use good quality materials … I would make some careful value comparisons here because some of them may be in higher budget ranges than other similar mattresses.