theres no point, insurance will kill you it will be around 2500-3k p/year for full comp through just car (the only insurance company that will touch you)
I bought an na r34 at age 19 and I regret it 2 years later for a variety of reasons but I can stress listen to the knowledgable people here and wait. Buy something else first. My first car was an r31 and I can't recommend them enough. Cheap to buy, cheap to insure, cheap to work on, easy to learn on and drive rather well.
If your hell bent on making a decision you'll financially regret I recommend buying mine off me.
In all seriousness what you want is either a gt-v or a gt-x (sedan). I've only seen rb25de versions in australia the rb25de is fairly sluggish commos are faster in a straight line...corners are a different story. Try to get a gt-v the lack of lsd and trouble with parts will shit you after awhile with a normal gt. gt-v's are the exact same as a gt-t just minus the turbo.