yeah xsperf is right. Buying a year old one is a pretty good idea. Most people haven't even put any miles on at that point and you save a few hundred or thousand bucks. And yeah just watch out for like trucks and shit. I have problems with them not seeing me in my bimmer. Imagine them when you're on a bike.
The main problem now that you've taken the course is not so much your own driving, but that of those around you. At least when you stop paying attention in a car you have a crunch zone.
With that in mind go kick some ass. You can outrun most cars in any bike. I'll have to find it but there is a video somewhere of a guy pulling a wheelie at 200mph going past a speed trap. The guy was going so fast the cop couldn't catch him. Also look up chris pfeiffer on youtube. That guy is crazy.
EDIT: not that you want to do that or anything