2001 Infiniti G35 or 2005 Nissan 350z?

I'm buying a car when I turn 18 in a few months but I can't decide what I want. I've loved the Z since I first saw it in tokyo drift but I recently fell in love with the G35 coupe. Whatever I buy is going to be "my baby". All my spare change is going into making it fast and pretty inside and out. So knowing my intentions what do you suggest? I'm not tied down to these 2 cars. I like nice sedans like the bmw 335I. Also I've gotten into *sigh* american muscle a bit so I'm looking at the new mustang and camero. If I got these they're staying stock until I get out of college. My max budget is 10 or15k. Whatever doesn't go to buying the car goes to fixing it up. So what car do you suggest?