Honestly dude, if you don´t like the GS500 don´t get one. However, the options you listed, the CB500 hasn´t been made since the 70´s and the Ninja´s are let´s face it, Ninja´s. The GS500 offers a WAY more comfortable riding position and only offers 3bhp less then the ninja. Also the Ninja is only 5mph faster top speed. Also the ninja is about 500 bucks more expensive and truthfully NO BETTER! So do you really want a bike that you have to explain isn´t actually a Japanese warrior with a funny hat and sword I think not. Also the GS500 gets better MPG´s.