What bed matress is best for me in my condition?

I have always suffered with low back pain and never was able to get a good night;s sleep until I invested in a Select Sleep Number system. I LOVE mine! You can adjust the hardness or softness to you liking. Also, in the queen and king sizes, you can adjust each side separately. I feel like I'm sleeping in a cocoon every night. I've had mine for 7 years now.