I currently have an 03' YZ450 with flywheel, pipe and resprung/valved suspension. I am 5'8" and 150lbs and in good physical condition. I ride the bike well but am very interested in the benefits of the 07 250F or 450F. Mostly due to the vast improvements since the introduction of the bikes. I ride mostly local tracks and Glamis and occasionally desert and mountains. I do not feel that the 450 is too much for me but my ego is not so large that I would not consider going to the 250F. I hope to gain ride ability, speed, handling with out missing out on the power (too much I know I know). Most of the guys I ride with are 90lbs heavier and on 450's. Any arguments for either direction on the new bike? Thanks in advance for your input.