I was diagnosed with Rheumatoid Arthritis about 5 years ago.  At the time we had a water-bed mattress.  I was constantly in pain over and above what I normally felt like from the disease alone.  My husband and I knew we needed to purchase a new mattress so we began shopping around looking at all the new therapeutic mattresses that were out at the time.  My doctor and several people I had talked to suggested that we check into the Sleep Number.  Of course my first thought was we wouldn't be able to afford it because I was convinced that it was going to be out of the ball park in cost.  We...