KrK.... are you responsible for the insurance/gas/tires/upkeep? Will you be in the near future? That can make a BIG BIG difference. Something like the 350Z, while nice, has relatively high insurance premiums, expensive tires, and can be rough on gas (if you're driving hard). Also, I would HIGHLY recommend buying a car that will last you six years--unless you think your parents will turn around and buy you another one halfway through college.
Personally, in your situation (if this is possible), I'd take a Mazda Protege5 (or MP3) and $14K in cash/investments. I promise the money will come in handy later, if that's possible.