I wouldn't waste the time on a N/A skyline. I test drove a few before I bought my first skyline and they felt no quicker than my 1.6l laser. Buy something that is cheap and fun to drive that way you can enjoy it without worrying about the massive debt thats going to be hanging over you head the next 5 years lol.
I did the exact opposite to that of course. Got a loan for a 33 GTST but was never happy with paying the interest on something I had no intention of keeping its just pissing money into the wind. If your going to put yourself in the situation where you have loan repayments every month and the debt just never seems to go down because the interest rates are so high then you want to have something that you are going to be happy with long term. R34 GTs just aren't that kind of car. Not to me anyway.
My 2c is buy a na silvia or something similar. Cheap, fun, reliable. When your off your ps buy the 34 then.