Hi Rsheezy48,
I would make sure that you do some careful and objective testing (using the testing guidelines) on the Tempurpedic Cloud Supreme (which the mattress approximates) for at least 20 minutes or so (or even a little longer to make sure that the memory foam has a chance to warm up) and then talk with them in more detail to help you decide if it’s a good match for you (see mattress firmness/comfort levels in post #2 here). Your own personal experience will be much more valuable than anyone else’s because each person’s needs, preferences, and perceptions can be very different … even with the same body type or sleeping position. Your highest odds of success are always a combination of careful and objective testing on a similar mattress wherever possible in combination with a more detailed conversation with a knowledgeable and experienced manufacturer or retailer.
You can read their guidelines for a suitable foundation or bedframe here and the foundation thread here has links to many options that would be suitable for a memory foam mattress (just make sure that whatever you choose meets their warranty criteria).
As mikeh59 mentioned … their return policy is great if in spite of everyone’s “best efforts” you end up making a choice that is less than ideal.
Phoenix