I had a hard time deciidiing between the gsx-f and the 650r, I test rode both extensively. I mean EXTENSIVELY! like a for an entire weekend for each one. ( my buddy owns a dealer) I then road my friends FZ6R. That was it.... power is right between them, weight is dead nuts in the middle. It pulls good all around, I like the feel, it tracks the curves without fan fair, it is just plain smooth.
I do like the gsx, but I do a lot of low speed in town driving, as well as highway for road trips.
Picture this as a smaller version of an FJR.

My sentiments exactly. I had the luxury of riding all three and the FZ6R was the clear winner for me. GSX650F next and 650R last. Just this man's humble opinion.