Can't go wrong with either bike. I have a preference to the '06 Honda CBR 600RR because I have one and love it to death! I also have a '04 Honda 599 which is a much, more comfortable bike with almost as much pep as the CBR. It has the old CBR 600 F3 engine, it's also a very sexy bike and very affordable. Besides, naked bikes are comming into fashion! Good luck with your search and I hope this helps.