[coogs08]

Just like mdosu said, go to a credit union that is near you. The CU's usually offer much better rates than the big banks. The process isn't too bad, if the current owner of the car is still financing it, the CU will have to obtain a payoff amount and send/wire the funds to the bank that has the lien on the title. Then they will have to set up the new loan and transfer the title under your name, with your CU holding the lien. I went through this for my M3 and it was pretty simple. I'll give you an example of how the numbers will work:

Purchase price: 45,000
Amount still owed on car: 30,000
Amount you're putting down: 5,000
Taxes, title, license fees: 2,000

The CU will wire 30,000 to the bank who has the lien on the title, paying it off, and allowing the CU to obtain the title.

The CU will cut a check of 15,000 to the seller.

The CU will have the loan prepared for you in the amount of 42,000 (45,000 - 5,000 down + 2,000 taxes)

Hope I didn't confuse you!