Hi MattL,
There are too many unknowns, variables, and personal preferences involved for anyone to make specific recommendations for someone else based on a formula, specs (yours or a mattress) or “theory at a distance” (see mattress firmness/comfort levels in post #2 here) but the mattress shopping tutorial here has all the basic information, steps, and guidelines you will need to know “how” to make the best possible choices … and know how and why to avoid the worst ones. The tutorial post also includes links to lists of the better online manufacturers and retailers I’m aware of (in the optional online step).
The better options and possibilities I’m aware of in the Fredericksburg area are listed in post #9 here and for the Richmond area are listed in post #5 here. The Baltimore list is here and the Washington, DC/Northern Virginia list is here.
As you probably know from your reading here Dreamfoam is a member of this site which means that I think very highly of them in terms of their quality, value, and service and their transparency and they compete well with the best in the industry. You can see my thoughts about the foam density (and the particular “review” you are mentioning which is very misleading) in post #2 here.
Plushbeds is a “better than average” choice compared to most mainstream manufacturers but for most people they wouldn’t be in the same “value” range as some of the other options that are available to you (see post #2 here).
You can see my comments about BedinaBox here. Their memory foam mattresses use lower density memory foam than I would be comfortable with (see the guidelines here).
Posts #3 and #4 here includes some of the better options for “lower budget” latex and latex hybrid mattresses I’m aware of and post #4 here includes some of the better options for lower budget memory foam and polyfoam mattresses I’m aware of as well.
Phoenix