Check out the Westin mattress,based on the ones they use in the Westin hotels. It is by far the most comfortable I personally have everb slept on. Not cheap,a king goes for 1800.00,but you will sleep like a baby.
With my bad back we've tried inner spring--sleep number & the floor none seem "consistent" for me, have not tried foam but about ready to. Our living room couch has foam cushions that helps sometimes. So far for "my" back the inner spring or the foam couch seems to help. Ross Puls
We've been sleeping on a Simmons Matrix Back Care pillow top for 9 years...and it's still wonderful....it is the best I've ever owned....I know lots of folks are buying the new memory foam or adjustable type mattress but I'd buy another Simmons without hesitation...
FREE TRIAL ON ANY OF THEIR BEDS FOR 1 YEAR. YOU DON'T LIKE IT THEY WILL COME AND GET IT AND CHARGE YOU ONLY $75 FOR RETURN SHIPPING.
You can mix and match the foam types on their air bed to get the comfort you are looking for and replace the foam in the future if your needs change or it breaks down like my Sleep Number and iComforts did.