Hey all, I've been trail riding for the last couple of years on my trek 4500. The bike's completely stock with alivio components everywhere and judy 2's. I'm looking not for the coolest upgrades, but the most useful. I'm also on somewhat of a budget, so I'll probably be making the upgrades slowly. You'll also have to be pretty specific in what you're talking about because I'll be the first to admit that I'm not too knowledgable on technical terms (although I know most/all the basic parts). Thanks in advance.