I would say **** it and get the Nismo-Z BUT I would look for a low mileage 15 or 16 ,let the first owner take the loss. I bet you could get a 16 Nismo-Tech for ~36, and dont be scared to look out of state considering distance.Your 27, single, and as long as your not counting on your GF to support you or the car go for it!!! Another thing, you will not be taking as big as a loss when purchasing a 15 or 16 if you decide you dont like it..
You sound like a level-headed guy so as long as you keep your money in order and pay your loan on time you should be fine plus your credit score will increase with timely payments.
Dont get the Crap-olaS you will hate that you did not get what you really wanted.