If you want good credit, just get a credit card and be wise with it. (You sound like you would be plenty responsible with it). Buy on it and pay it off alot and your credit will blow up, in a good way.
<has a 680-690 credit score @ 21. Not great, but I'm working on it. I'll be happy with a 750.
Nice job on the price of the car! I got mine for about $18k (I think it was $18030 or something) and I thought that was a good deal, I should have gotten it for like $16k!