I'm going to have to jump on the bandwaggon here..... You can't "out grow" a modern 600. Buy a 600, get comfortable with it, and sign up for a track school. The track is the only place you will really get a good handle on what the machine's full potential really is. You will also learn more in a weekend at the track than a month on the street. Here's a larger pic of mine.
![]()