I just got my license a few weeks ago. I wanted to start with a brand new gsx-r 600. Instead I bought a fzr 600 and believe me it's FAST. But, I did get used to it quickly even having never ridin anything except a 50cc aprilia scooter. Because of age/mileage it doesn't have the reliability I want and I am going for the gsx-r 600. I might actually go tommorrow to finally buy it. I was there yesterday looking at it. But what I want to say is that while I got used to my bike it is still EXTREMELY fast and just because I got "used to it" doesn't mean I can push it to it's max, because I can not.... you can rarely go full throttle, only on the rarely found straightaways by me... And the gsx-r will have about 20% more power and weigh maybe 15% less. What I'm trying to say is just try out a 600, maybe an R6 if you like yama, but if your stuck on bad-ass mode don't get the R1... The GSX-R 1000 is the ULTIMATE supersport bike. Most power and fastest 1/4 out of virtually any bike. (only one with sub 10 1/4 out of the R1, 954RR, Ninja 900, even faster than the ninja 1200 or the CBRXX 1134)
I just say 600 it up like me... I feel not many drivers act more responsible than me in the car but when I'm on the bike I get crazy sometimes....
Good luck with whatever you do be safe and always watch for cages
Pat