I'll bet this has been asked before but I'll go ahead anyway. I have a Trek 4500 mountain bike that I got from my buddy who is an avid biker. It has the v-brake setup but it also has mounting for disc brakes. My question is, is it worth the time and the money to do the conversion or should I just keep this bike as a beginner bike? I don't plan on getting anything new until I'm more experienced. I've heard that it makes more sense to just buy a new bike with the disc brakes already on it.