Maybe you should have him read this thread? People in this thread have a huge variety of knowledge and experience. Racers to novice, old to young.
my .02: any bike can kill you. The speed going though a corner is based on the rider, not the bike. Any idiot can open up the throttle on a straight road. I've passed liter bikes on my 600, and I've been passed by another 600 with two people on it. It's always the rider, not the bike. Chances of riding a 600 to it's full potential are pretty slim, I'm not even close yet. No matter what bike he gets, respect it, or bad things can happen.