I have an 01 YZ250F and it has been great. I picked it up used last summer and other than a few stupid moves on my part it has run like a top. It is quick and... well you all know the rest. Next summer (winter is approaching here in Boston) I am thinking about swapping out the old for a brand spankin new bike and I am debating if I shoud go up to a 450F or stick with another 250F. I can control the 250 well but realise tha a lot has change from the 01 to the 05. I ride 50-50 trails-track. I dont race yet but when my son is older and we can di it together I plan to get involved. I am competitive and a good athlete. I am 6'1" and about 190lbs. Will the 450F be too much machine for me if I ride 50% in the woods by my house? My local riding buddies ride XRs and my wife is on a CRF150F... needless to say I get stuck doing a lot of waiting and looking behind me... But I want the 450 juice!!! Will I be frustrated? OR am I just imagineing things? THanks!