I'm pretty sure I want a raptor, but just for kicks and giggles I want to know everything there possibly is to know about yfz 450r's. What years were they made? is there good and bad years? What upgrades were made over the years? What problems did they have, what should I look out for when buying one? How unrealistic is a 4500-5000 dollar budget? I pretty much want to know anything and everything.