We looked at tempurpedic, sealy, simmons, serta, etc., price not really an object within reason. We were looking to go from queen to king, as we both stretch out, and the cat sleeps at the foot of the bed.
We didn't like any of the tempurpedic mattresses between the two of us. We sunk in nice, but we weren't comfortable.
We found at sleepys that they offer a "customization" by knightsdowne, based upon pressure points and how you lay. Their matrrsses are a combination of foam and springs. The boxsprings have a huge number of internal springs, and all pieces are very heavy
They customize the firmness and design half and half based upon the customization. The options aren't that advanced, so they have most next day.
Amazing how much better we sleep now.