the 600rr will serve you well, and will go as fast as you ever want/let her. my first track/race bike was an 03 600rr and had/have an 08 zx6r and 12 675R after that, and the rr remains as the most stable mid corner, and i'm pretty sure i late braked the best on it because it was a very confidence inspiring bike. sometime, false confidence, but inspiring nonetheless.