TEMPUR-ProBreeze Medium Hybrid 12" Mattress

My wife (5ft 130lbs 50yrs) and I (5ft 8in 160lbs 45yrs) are looking to get a new mattress and are ready to do what it takes to get a quality mattress thay provides a good night's sleep. She normally sleeps on her stomach but sometimes a back sleeper as well. I tend to toss and turn a lot trying to find comfort between back, stomach and side. Our current mattress is an old coil king size that we have had for 10 years and is now very uncomfortable (maybe source of tossing and turning). We went to a mattress firm store and laid on various beds but found that the medium hybrid tempurpedic beds (proadapt and probreeze) were very comfortable. We went back a second time debating getting a Costco version of tempurpedic called the supreme (maybe?) but when we laid on the probreeze hybrid medium it was just a noticeable difference that we really liked. With all that said here are my questions. I am concerned that our in store experience may not reflect reality of what we actually get at home and am wondering if the perceived difference between the probreeze and the proadapt are actually all that different in feel. We are not concerned with any cooling affect, just the actual comfort. Does anyone know if there is an actual difference in mattress support or foam quality comfort etc. between these two? Any experience choosing a tempurpedic mattress to help me not fall victim to spending an extra $1000 due to good marketing? Is the probreeze really that much ore mattress than the Costco tempurpedic? Lastly, I was very impressed with the adjustable bed bases and am seriously considering purchasing one with this mattress. The tempur brand they sell is around $2200 but there seem to be third party brands (jetbed?) That i have seen online that seem comparable. Is it important to get the tempur brand base or does anyone have any suggestions on a good third party base that works fine for a tempurpedic but is a zero access (fits flat in our existing bed frame). No extra bells and whistles, just moves the head and legs up and down. I have tried finding my answers before posting but it seems I may get a more accurate answer with this complete explanation. Thank you in advance for any help with my analysis paralysis.

That is interesting to hear. The proadapt and adapt were hard for me to fully tell the difference between but when I or my wife laid on the probreeze it felt like the foam settled into the back of my neck and small of my back more so than the others and felt more supportive. Knowing that these mattresses can have a different feel over time I wasn't sure if what I was feeling was a difference in break in or quality of mattress (the sales clerk couldn't tell me the age of the floor models). Thank you for your explanation of the temperature affecting material (not just necessarily cooling) that does help. RealRedda mentioned the ergomotion bed frame and they are on sale right now for just over $700 for the rio 3.0 (basic with one memory setting) which makes them pretty attractive to me. I am hoping to use the zero clearance feature to fit this onto a Brimnes bed frame with storage drawers underneath.