Hey mate, there's nothing wrong with getting a n/a 34, if you really want it then go for it. I've owned two 34 n/a's, currently still have one, been working hard to have bought them and to keep them running.
If you can drive a turbo then of course i'd recommend getting a turbo or save up and get a gt-r. If I wasn't on a extended period on my P's then I would've bought a turbo and not bothered about getting a n/a. Yes the n/a's are slow, yes they have massive p-plater tax on them and you can get cheaper, faster or more reliable cars for that much money but if you really want it and are passionate about getting the skyline then go for it. Just my 2 cents, s15's, ae86's, etc the same thing applies imo, if you really like it, go for it.