I go to the track almost every weekend and go to ocotillo 3 or 4 times a year. The 426 is a great bike with a lot of hit nad very versatile but its aptitude at the track is not up there with other bikes. I am planning to race mx this winter. From what I have read it seems like the 06 450 was a very good year. I rode my buddies the other day and it felt lighter and more nimble than my 99 RM250. For these reasons I am considering selling the 426 and get the 06 450. The red sticker is not an issue with me as any green sticker riding can be done with the RM. The 06 450's seem to be going for ~$4200 to $4500 right now. So any input/advice here would be greatly appreciated.