Keep the Infiniti. They are just as good and more practical. Just use that 6,000-10,000 you have to upgrade your car.
Buy Rims + Coilovers + Exhaust system + Front lip and call it a day..
When you finish school buy the newest Z to come out :) who knows it could have a v8 or a twin turbo :p

well if you want I just traded in a red 370z nismo 2011 to a Nissan dealership last week. It had 500 miles on it.

They offer me like $28,000..I know that's sucks, I sat in there like a long long long time.. It only 5000 miles on it, that's very low..and it also comes with navigation package and premium package. And the car condition is good!! It only a year, and it's auto. They said there is more model from 2011 come out, so they only can offer me this. So as my budget problem, I only get the 2011 370z touring with sport package. That's a bad deal at all.. it takes me like 13,000 to trade in, I except 6,000-10,000.

I went to Fontana Nissan.

Oh shooot.. you only tell me earlier..Thanks anyway..