by the time you get your p's turbo 33's will probably be cheap enough for you to buy 1, but you won't legally be able to drive it.
if you want a NA skyline as your first car then get that. then once you are off your p's either sell it and buy a turbo skyline, or drop the motor out and put a turbo motor in. here are some of the mods you have to do-
buy the turbo, intercooler and piping, and manifolds and exhaust
buy a new clutch
get a thicker headgasket put on
get a new ecu (to have it run well)
new fuel pump
have oil and water lines drilled into the head
now if you go an aftermarket turbo setup, you are looking at $2500-$3000 just for the turbo, which is the same money as a turbo front cut. but the turbo motor will handle much higher amounts of boost. an the boost you could run on the NA motor with a turbo, you probably would only just make it to the power of a stock turbo motor, if you were lucky.