Two weeks ago I put money down on a 2007 WR250F that is due in October. Yesterday I called the dealer and we reworked the deal for a 2007 WR450F instead (due in November). I was afraid that I would be wishing for more after a short period time with the 250 so I decided I might be better off going with the450 now. It's been many years since I last rode my old YZ250, but I'm excited about having power once again. My thought is to go with the 450 and not perform the mod's until I'm used to the power once again (and if I desire more) versus purchasing the 250 and performing the mods immediately. I'm 5-10 and weight 195 and the trails we ride are mostly straight and open (trails are not tight where the 250 would probably have a big advantage). The entire family currently rides air cooled CRF's and we are all moving up due to the boys are out growing their bikes. My wife is taking my modified CRF230 and I am going to a WR (bored with the 230). Are there any of you that purchased 450's that wish you purchased a 250 instead? What is the 450 like without performing the mods compared to a YZ250 2 smoker? Thanks for any insight you may have.