If you're doing mostly highway commuting, I wouldn't recommend a 250... It's a good city commuter bike but you will get tired of the lack of power very quickly. I would definitely recommend a 500. I've owned the kawy ninja 250, then bought a 500 after a month. So you just have to ask yourself, if you are commuting daily on the highway, 500 will definitely suit you best. Hopes this help, best of luck!