I can anticipate two schools of thought on this one...
1) You're already taking on big debt, so what's a new car going to hurt?
2) Don't take out any more $ than you need, and a new car is definitely not something you need (assuming your current one still works).
Being from Michigan, I LOVE cars, but I'm all about the second philosophy. You don't need a car payment while in school (assuming you could even get financed), nor do you need to take out another $10k (or whatever) for a good used car. You've got time, why not drive the car to wherever you'll be going to school? If you're not into road trips, you could have it trailored over for a lot less $$ than the cost of a new car.