zero_eden_delmo replied: "If your looking for older models I am going to highly recommend the 2003-2006 Kawasaki Zx-6R "not the Zx-6RR". They have Kawasaki's legendary 636 engine in it. The Zx-6RR was made so that they could race in the Superspot class, so it uses a traditional 600cc engine rather than the 636cc. The bike rides great and is fairly comfortable as far as sportbikes go. Really the only problem was that when people raced them the tranny would give out. But for street uses you would never see it. As far as Yamaha's go I would recommend the Yamaha Yzf-R6S rather than the 2006-2009 R6. They really fixated on it being a race bike. So the consumers ended up with a painfully awful riding ergo’s. The engine was also set up to be racing influenced. So don’t expect any power until you reach the 12,000 rpm's mark. Than it's going to kick you in your "u know". Many people seem to almost like it because it makes the bike feel faster than it actually is. Your wrists and back will thank you for getting the far more road worthy R6S. You should really look closely on the model's Kawasaki's 2007 and up Zx-6R's use cassette style transmissions which are THE BEST. And class leading Slipper clutches. Really the only thing they were missing was some more Hp which they got for the 2009's. The 2009 Zx-6R is the fasted 600 EVER!. Not kidding. I will show the link! And has dominated the 2009 class for both street uses and track. You really need to just go and sit-on and possibly test ride them to be able to get a feeling of what each of these animals are all about. And if you think I am siding with Kawasaki a little too much. Keep this in mind I absolutely HATE the way they look .That’s why for now I am staying with my Suzuki. But mechanically they are beautiful. I am hoping Suzuki follows foot so that I might have a reason to upgrade my 750."