if u want to start the right right way get a ninja 250, those bikes are bullet proof, we've droped my friends maybe 50 times and it just keeps putting. as far as best 600 to start with, if u want something cheap to fix if u drop it get the fzr600 or an f-series honda. if u want a 600 that will last you from beginner to a few years after learning get a gsx-r 6 but they aren't cheap to fix after being dropped.