^ Private sales will be your best deal, unless you really need to finance. IMO, I would go for a Ninja 250 before 2008, it'll be even cheaper and you can just resell it once you're done with it. Check craigslist and if you have a local motorcycle forum, check them too. If you don't know much about bikes, take a friend who is mechanically inclined to check it out with you. Most people aren't going to let you go on test rides with the bike without cash in hand as a security measure in case you drop it.
Cars and bikes are 2 different things. Go take the motorcycle class, start off with something small for a month or 2, then go get the bike you want.
Some good starter bikes are Ninja 250, Ninja 500, Ninja 650, Suzuki GS 500 and Suzuki SV 650. Nope, they won't look as cool as a CBR/Ninja/R/GSXR, but the main difference is they are more forgiving to ride and that's essential, especially if you are just starting out. Think about it this way, if you accidentally add too gas on a rwd car in the rain, you spin out. Maybe hit the curb or another at the worst case. You loose control of your bike and you'll be going for a ride. Lots of possibilities on what'll happen to you if you get low or high sided or even if you hit a curb/another car. When you get on a sports bike compared to a starter bike, the throttle is a lot more responsive to when you pull it. If you're just starting out and aren't used to reacting to certain situations on the street yet, it could be very unforgiving.
You could look into the Honda Rebel.