My son recently replaced his 15+ year old mattress. We recommended a memory foam since my DH and I got one in the fall and like it. He got a Cocoon by Sealy (you can google that). It was an "Oprah" pick and he LOVES it. They have a 100 day money back guarantee and it ships right to your house. They have a cool video on their web site that shows how it springs to life out of the box. Memory foam is not for everyone, but we had been sleeping on a pillow top that had formed "trough's" and that was killing my back so I wanted to try something different. No regrets!