I love our SelectComfort bed too! Ours is 12 years old and one of the best investments dh and I have made. We both sleep great because he likes a firm mattress and I like soft.
We bought the second cheapest model. I like my side soft so the pillow top on a soft setting made me feel like I was sleeping in a taco shell. :P They do run sales--if you know someone who has one ask them for a coupon. I still getting them in the mail a few times a year.