Take it from me:

This is my first year- and I run a GSXR1000. Way too much bike and I am always getting smoked by 600's. Not to mention, I am holding a lot of people up in my class because I am slow in the corners and somewhat speedy on the straights. I know this drives people nuts that are trying to pass me on the smaller bikes. The 1000 goes into turns like a freight train on crack.