you are about the same build as me. I am just shy of 300 - roughly 285 - 290lbs and I would jump on a 600 all day long just cause I know how to ride it. personally I have a 750, used to have an Aprilia RSV. I ride the track only, no more street for me on my own bike but I tend to borrow a friends 600 from time to time and trust me, that bike as more than enough for me on the streets, yeah I cant power wheelie it but I can clutch it up if I am in the mood to wheelie and I will roll with the 1k or leave them in the twisties.

everyone that has never been to the track seem to think that just cause you are a big guy, you need a big bike, its not the case. you can have just as much fun on a 600 and if ridden the way it ment to be, you hardly need the big bikes unless you are on Daytona