I'm not sure what experience you have with bikes, but if it's your first or your first in a while DON"T get a 600 cc sports bike. It will most likely get you killed very quickly!
Start off with a basic bike under 250 then move to maybe 400's and onwards from there. Starting off on 600's is as dangerous as going from a 250 to a 1000cc superbike.
600's sportsbikes now are incredibly fast, I've scared myself silly on one a few times and thats with 15 years + racing/track experience.
If you are set on a 600 sportsbike get something less track orientated. Like a CBR 600 or what ever the honda model is. Something like a R6 is more track orientated then the likes of a CBR which is more road suited.
Mate of mine has a Gixer 600 and I'm drifting out of corners to keep up with when the pace heats up. Of course in sweeping corners and straights he's dust.
Enjoy your new bike, but take it easy. Go to an advanced riding course is a must. In addition go to one of the superbike track schools. There's a few in the US and they are excellent.
...-Gixer