Hey bro,
My Z is the first "Brand New" car I have ever bought. I am stationed in Germany so I special ordered mine. I went on my 3rd deployment and came back to a brand new Z in my garage! I
was always against buying a new car because of the money you loose. But this is a sports car and I know that I am the only one that has ever driven it, (except the people taking it on and off trucks and boats).
If you plan to keep it in mint condition and it be your hobby car then get a new one. If you are going to make it your DD and run the crap out of it then just get a used one.
Good luck with your decision
PS- USAA has great rates!