I'm looking to replace the crankset/chainring and bb on my single speed bike. I purchased the bike used and use it for pleasure as well as a physical fitness training tool. It's ridden hard. I plan on keeping this bike for quite awhile. As I replace different components I don't shy away from the more expensive if the extra money spent is on components that are as good as advertised. When it comes to cranksets/chainrings and bb I know very little. Campagnolo Record Pista, Dura Ace FC 7710, and Sugino 75 have all been suggested as top flight equipment. I'd appreciate input from the more experienced. Thanks.