Okay, so I see alot of the replies that people have left you and I will give you one different. The best thing for you to do is to get a loan on a new car and utilize the money that you have as a down payment. How you do this is extremely important. Here is what you want to do. I am going to give you a basic scenario below showing the best breakdown to help build your credit score for the long term (you could pay cash for the car, but then you would have the same problem for the rest of your life whenever trying to buy a new car)
Let's say the car you wanted is $15,000 with tax, tag, title and all the works. Let's also say that you have $5,000 dollars cash in hand. Tell your auto dealer or finance company that you want to put down $2,500 in cash (most lenders are going to require this anyways to obtain your first car loan). After you are approved, ask what your APR (annual percentage rate) is, and find out if putting more down will qualify you for a better rate. (it will probably not unless you are putting down significantly more).
Now when you make your first payment, send in the other $2,500 that you have as a direct payment towards the pricinpal (you dont pay interest on that amount).
I have found that this is a great way to build your score and mantain lower debt ratios. because on your report, the loan will show up that you borrowed $12,500 but that you only owe $!0,000 after the first month.
Of course, with all pros, there are cons. The con here is that your interest rate was based off the original loan amount, so it will remain a bit higher than if you just put the extra $2,500 down to begin with, but once you build your credit score, then refinancing to get a better rate is probably something you should do anyways. In the long run, you will have to pay a few more dollars, but you have to weigh that for what you get in return. Plus, the higher amount you have financed before, the easier it is to get higher amounts in the future.
Hope this helps a little
