Although i own a ZX-6R, i kinda don't like the bare body lookn' design on the 650R. Not to be mean or anything but if i was to buy a bike this year i'd definetly go with the ZX-10R. Also kinda wish that they kept the exhaust on the side for a year or two, i'm gunna miss that, but that's ok. Just my opinion.
I have to say that I like the 2006 636. I don't need the power in the 14 or 10. I enjoy tearing up the twisties with a smaller, lightweight bike that can really let you turn open those corners. Just my opinion.