Hi emperorboonday,
There are too many unknowns, variables, and personal preferences involved for anyone (including me) to recommend a specific mattress for someone else (see mattress firmness/comfort levels in post #2 here). Restava is one of the members here which means that I think highly of them but they have also recently changed their specs and and I am still waiting for updated information from them so I would hold off with a purchase from them until their new specs are clarified (see post #20 and onwards in this topic).
There is also more about the different ways that one mattress can “match” another one in post #9 here that you can use as a reference point when you talk with each manufacturer you are considering.
There are several manufacturers in the online memory foam list here that make a memory foam mattress that uses the Tempurpedic GrandBed as a reference point (including Restava, Select Foam, and Christeli) and there are also others who make memory foam mattresses that compare their mattresses to some of the other Tempurpedic mattresses as well (if there are also other Tempurpedic mattresses that are suitable for you in terms of PPP).
I would also keep in mind that how a mattress “feels” is fairly subjective and different people can have different experiences and perceptions on the same mattress so while some people may say that two mattresses are very close … others may perceive the same two mattresses as being more different. In other words … while two mattress may have similar levels of pressure relief and support they can still “feel” different and use different quality/density memory foams. This is part of the reason that a good return and exchange policy can be an important part of each person’s personal value equation so that you can decide how similar they are based on your own sleeping experience.
Phoenix