honda really lacks the speed and torque and im not impressed by the cbr's at all really

the 636 is really comfy and the power and speed are awesome on the bike but it has a little bit wider build then the other bikes, plus has that nice slipper clutch on it (dunno if the other bikes do, just going off experience when i had the 636)

the r6 is more thin and has better torque and speed the the 6rr imo

in my experience with the gsxr is they lag when you try and get on it.

so my suggestion on the bikes would be between the 636 or newer or the r6.