I don't think you over paid bro. I just picked up a certified 09 with 16k a few weeks ago and the only difference between ours is mine has Navi but you also got a 1k+ exhaust. I ended up paying 30 even. I was able to get a 1.99apr because I have immaculate credit and I chose the 48 month plan but I think they offered me the same rate as you if I chose the 62 month plan if thats what you got?
Heres a link to my welcome thread with picks at the bottom. Welcome to the community from another noobie.
New owner in CT