Take the course and buy a used bike. If you HAVE to have a 600 (which I really wouldn't recommend) an F2/F3 is fine. Its not like driving a car and its a lot more skills. Thats why starting on a ex 500 or even a 250 would help you with tuning your skills so when you did move up to a bigger bike you will be more ccomfy in emergency situations and daily riding technic. You want to be able to RIDE your bike not just try to manage it.
www.sportbikes.net you can also read up on reviews on good beginner bikes and anything else you need to know
