The Bandit is a good bike, I'm a big fan of naked bikes. The 600 will be a little smaller than the 1200, but not enough that you should be uncomfortable. I'd be a little leery of the one you posted because it probably needs a new fairing, and those can be pricey. It also means that it has been down, and there could be hidden damage that you can't see. I'd wait and spend the money to get one that doesn't need a lot of work. Age is not as important as it is with cars, an older low mileage bike will be just as good as a newer one with similar miles. The Bandit has been around since the early 90's, so you should be able to find a good one with a little patience.
I'm not sure where you are, but here's an example of what you can find with some digging:
http://adcache.cycletrader.com/5/7/8/89548978.htm