Hi firebluephoenix,
I’m happy to speak to the quality of materials or the relative “value” of a mattress but as you can see in mattress firmness/comfort levels in post #2 here … there are too many unknowns, variables, and individual preferences for me (or anyone) to make specific suggestions about which mattress or layering combinations may be most suitable for you based on “theory at a distance”. The best way to choose a specific mattress or layer combination is through your own personal testing and experience or with the guidance of a knowledgeable and experienced manufacturer or retailer that knows more about the designs, options, and materials they have available and how they might “match” certain body types and sleeping styles based on “averages” than anyone else.
The same post links to several sections of the site which has generic information about layering and mattress design which can give you some insights into some of the “theory” involved but these are only generic and not specific to any individual person.
Phoenix