I am going to get serious about racing next year( I don't know how many I have left) and I am torn between the advantages of the YZ 250(2str) and the YZ 450. I think the weight issue is even once you add the bigger tank on the 250 to get the same range as the 450, but easy restarting is a big plus in the 250 column. Extra dollars on the 250 include bigger tank, Gnarly pipe, flywheel weights, and SA= $600 extra on the $5600 The 06 450 seems like the ultimate HS weapon with minimum extra dollars. People have said that switching between 2 strokes and 4 strokes is tough. Any thoughts?