I'll also add that fuel and tyres WILL cost you a fortune if you daily drive a GTR. You'd want to use BP ultimate or something similar, which seems to average around $1.60/litre. So depending how much you drive you'll be spending at least $80-$100 a week on petrol (if you don't fang it). Daily driving means you'll need a new set of tyres each year, and you'll be paying, at the very least, $200-$300 per tyre (you'd want something decent, no point having an R34 with $hitty tyres). There's another $1k+ each year. You have to factor in insurance as well, which will be expensive for a young driver.
You know you can afford to buy a GTR. You have to do your research to see if you can afford to run a GTR. They're two very different things.