I have a 2001 CBR600 F4i. This was the first year they started making them. I am 6'0" 167lbs. When going on longer trips, I like to go into a full tuck so the wind doesn't beat me up as bad. It does get a little cramped after a while, but the roads here in the southern part of IL are very boring and flat, unless I go even further south. I've ridden dirt bikes all my life, this is my first street bike though, and I am SOOOO glad it's in the garage. So much fun and so quick it's awesome.
Don't let people BS ya about the Gixxer or R6 or CBR eating this or that, it doesn't matter which bike you have. All of them are pretty well equal for the most part. It's all in the rider. Yeah the CBR may not be designed for strictly racing like some of the other bikes, but it will hold it's own and/or kick the other's ass if you ride it to it's ability, which I will never be able to do. Same way for the other bikes, they will eat a CBR if they are ridden by a good rider.
Couple other things, don't spend all your $ on the bike. I have a full set of boots, leather, and helmet, which retails for over $1100 for it all. Get this gear and WEAR IT. People in vehicles don't watch for ya all the time and I've seen pictures of people I know that dropped bikes, not pretty. And if you get a CBR, especially a newer one that is not under warranty, make sure you have a shop manual and about $50 for a CCT (cam chain tentioner) so you can change that cuz they suck in CBR's. Mine is rattling bad, so I'm ordering a manual one, not OEM, from APE Racing.