Hi sleptaway,
The first place I would start your research is the tutorial post here which has all the basic information, steps, and guidelines you will need to make the best possible choices.
Post #3 here and the posts it links to also has more information that would be helpful for those that are in higher weight ranges that will likely need more durable and firmer materials.
Both SleepEZ and Dreamfoam are members of this site which means I think very highly of both of them and they compete well with the best in the industry. They would both be well worth talking with on the phone and I wouldn’t hesitate to buy any mattress from either of them that I believed was a good match for me in terms of PPP, durability, and the other parts of my personal value equation that were important to me.
Post #3 here and the adjustable bed thread it links to has more information about buying an adjustable bed that may be useful and includes some good sources that you can also use as a pricing reference as well.
The short answer is no. There are too many unknowns, variables, and personal preferences involved to use any formula or “theory at a distance” to predict which mattress someone may do best with out of all the thousands of choices that are available. Your own careful and objective testing or experience is the best way to know whether a mattress is a suitable match for you and if that’s not possible then a more detailed conversation with an online retailer or manufacturer is the most reliable source of guidance about which of the options they have available may be best for you (see mattress firmness/comfort levels in post #2 here).
Phoenix