I ride a 250f and am considering a 450f. I weigh 170 , 44 years old and don't race. I ride mostly on the track and some trails. I've never been totaly happy with the power on the 250. I've spent a lot of time on the mods and jetting and it's still boggy. My concern about the 450 is that it may have too much power for my weight and skill and I might be more likely to get hurt. I rode one this week and loved it. So I would like your feedback on things like is it harder to handle because of more weight, is there a better year model to get, what mods are important, etc.? I'm looking at '03's in the $3800 dollar range. Thanks in advance for your input.