I have a trek 6000 that I bought in 2000. I would like to pretty much upgrade everything on it except the fork and wheel set at the moment. So everything drivetrain and brakes needs to be replaced. I dont really know what to get or how much I am looking at. I need to be able to shift underload, or at least smoothly on regular riding. How much am I looking at? Also, is there a book or website that I should look at that will tell me how I would replace and adjust all these things so that it runs perfectly smooth? Thanks for help.