Hi kws87,
The first place I would start your research is the mattress shopping tutorial here which has all the basic information, steps, and guidelines that can help you make the best possible choices … and know how and why to avoid the worst ones. As you can see in the guidelines here … I would generally avoid the major brand mattresses you are looking at or any mattress where you aren’t able to find out the specifics of the materials inside them although I know you were probably just using them as a reference point.
The tutorial post also includes this link to a list of the better online memory foam options I’m aware of and many of these sell mattresses that use the Tempurpedic models (or some other major brand memory foam mattresses) as a reference point for how they feel and perform. There is also more about “matching” one mattress to another one in post #9 here that may be helpful when you are making comparisons.
The better options and possibilities I’m aware of in the Atlanta area are listed in post #2 here.
I also wish that Restava would get back to me with their updated information about the materials in their mattresses (which they haven’t yet) but for the moment I would put them on hold until their updated information is available and you can make more meaningful comparisons between them and other mattresses.
Phoenix