Hi lpad007,
Outside of the information I linked in my last reply … I would always keep in mind that the first “rule” of mattress shopping (or mattress design and construction) is that the only way to know for certain whether any mattress design or combination of materials is suitable for you is based on your own personal testing or sleeping experience and that there isn’t a “formula” or “theory” that can predict which mattress or combination of materials will be best for you based only on specs (either yours or a mattress) or “theory at a distance” (see mattress firmness/comfort levels in post #2 here).
There is also more about the different ways to choose the most suitable mattress (either locally or online) and how to identify and minimize the risks involved in each of them in post #2 here.
The better options and possibilities I’m aware of in and around the Springfield, MA area (subject to the guidelines here) are listed in post #4 here.
Phoenix