I know exactly how you feel, I was there at one point. I did enjoy the ttr-250 up until I sold it, but I constantly felt that I needed something better. The wr450 has never left me wanting more power, ever. In fact, sometimes I ride at places that the power seems like "too much", not uncontrollable, but evident that I've got too much motor under me for that trail. Riding trails in the woods, the bike hardly ever sees more than 1/2 throttle, sometimes 1/4, but as soon as there's a fire road the throttle goes WOT at least for a few seconds. The factor that would tip the scale for me if I were in your situation would be the possibility of making it street legal and using it for transportation. At your age though, insurance might be a bit too expensive. Do plenty of research and see how much of a financial burden the bike would be for you. Take your time and think it thoroughly. Yeah, well like I said I have all winter to consider it.