Ooh, in that case get the 08. My 07 also had very low mileage, that was fixed very quickly
Only problems on the 07-08 is the ECU - some have problems starting and keeping idle when hot. This can be fixed with a throttle body sync. Then there is the 2nd gear 5,500RPM issue - when you throttle in that area nothing happens. A replacement or flashed ECU will fix that.
Other than that, very pleased overall...
This only affected 07 bikes to my knowledge. When the dealer replaced my ECU with an 08 model the 2nd gear 5500 stutter went away.
Let me chime in a little since I have ridden both street and track.
-07/08 does have a better suspension. If you get an 07/08 lower the bike on the forks 5mm. It makes the bike tip in and feel much more stable through turns.
-Brakes feel the same to me
-07/08 has a bigger top end
-09 has much better mid range. Makes exiting corners MUCH easier. On my 07 I have to hit a downshift to get into the 10k rpm usable power range. (07/08 can be fixed with a -1,+2 sprocket).
-09 seat position feels more comfortable(personal opinion from a 6'2" 200lb guy)
-09+ A,B,C mode allows you to adjust the bike to your riding style.
-12 will have TC, which can be a good or bad thing. While I am not good enough, I have read reviews of TC being too much. Some guys like to slide the back end around.
Thats about all I can think of currently. Good luck with your decision.