If it isn't broke don't fix it. Keep riding your stumpjumper until it stops working for you. I went through the same thing. The last bike I built was in 1999 and when I left Colorado for Florida, I stopped riding for a while. I got back into it in 2006 and was surprised how components had improved. You definitely get more bang for your buck now. I had to buy a new bike after my old bike was getting to expensive to fix.