heydude, you already have a lot to go off in this topic and it sounds like in your previous post your going to make the (financially) correct decision.
However in black and white terms it's never a good idea to borrow money on a depreciating asset especially a moneypit like a performance car, I guess everyone has their own priority list.
Unless your a moneybags or born into it, you will have to do the hard yards at some stage in your life, how hard and when is upto you.
But your initial question, I think save get off your p's finish study's land a sweet job and get a r34 gtr
I bought my 32 with cash about 7 years ago and have spent well over 50k on it totally enjoyed everyminute of it so far even though it is a track only beast now that sits in the garage more than anything else. It is still a dirty moneypit that has eaten up more than just discretionary funds at times. Far too much of a burden with a part time job IMO.
My 2c
Cheers