2000 or 2001 Trek 1200 with Sora component group. Triple chainring and 8 speed in the back. The drivetrain is worn and I am looking for a replacement/upgrade. I have done all of my own bike repair but I have never done an upgrade. Can anyone give advice on how to ensure compatability and choose components? Shimano 105 seems to be where I am going with price. Input on wheels also please.