One of my bikes has an Ultegra 9 speed bottom bracket (6500). Bearings are going and prices for new replacements are steep. If I spend the money for a 5500 or 6500 bottom bracket, I am relegating myself to 9 speed drivetrain for a while longer. Not a bad thing as I have plenty of cassettes and some extra shifters. One option might be to replace the sealed bearings in the existing bottom bracket. Does anyone have experience with this? Another option is to go with a 10 speed bottom bracket and crank, but that might give some chain rub issues due to spacing up front. It is also even more up front dollars and, if I'm going that far, I might as well consider buying a 10 speed groupo. I am sort of rambling here as I'm not really sure which direction I want to go, and would like to hear the forums thoughts. In case it matters, I am mechanically inclined and have built a few bikes.