Looking for advice on buying a new WR 450 or the 250. I live Colorado and want to get back into the dirt. My riding skill is good but outdated. Last off road bike was WR400 in 99. I want all around bike that can do a little street(between trails) but get with it off road. Trails are mixed from tight to wide open. Any good places to get information and advise? The light weight 250 sounds nice but i am concerned the power is a little to weak for the altitude.