You should be fine with a 600. just remember when on the street that you gotta watch out for other people since they don't like watching out for you. i'd say about 75% of accidents i've seen or heard of are from operator error (going beyond your limits too soon) and other drivers just overall not looking for motorcycles. remember that and you should be fine. oh, and the throttle is pretty sensitive when you first get on so don't overdo yourself.