seriously, i want to say save most of it since economy is doing bad and things are going to get expensive. but i would probably dedicate maybe no more than about 1500 to spend on your car and put the rest away. dont spend all 4000, unless you make 100,000/year thats my 2 cents.
before even think about the car. the first thing I would do is pay off all my debt, if any then I will think about the car and I would not waste the whole 4000$ in the car, I would make a trip to Hawaii or something with the rest.