I tried all but the Honda and chose the 05 GSX R600 in the black & silver. easy choice for me. Aside from the fact that it looks better, it seemed to scream a bit better than the Kawi & the Yamaha. Better chasis and had a steering damper standard. 600 class bike of the year last year and nothong has changed. I love mine. Also the 636 is geared to be a bit more street friendly and I want to hit the track. I like the ergos of the Gixxer better too. Oh yeah, maybe it's just me but the stacked headlights are cool.