R32 Gt-R's were built until late 1994. So the youngest of them is 13.
I own one, so I would like to think I know what they are. (It is my 4th). Consequently I look after it well. If it needs fixing it gets fixed properly. I certainly doesn't get "the pants driven off it". It doesn't have a rebuilt engine, nor does it need one.
If you are looking at a budget I would suggest $25k for a late model, relatively stock example. Buy a nice one, not a cheap one. Don't get too enamoured by the mods, the car itself has to be good. There are plenty about locally to the extent that I wouldn't bother importing one yourself unless you know people in Japan.
A good R32 Gt-R will probably be the best car you will ever own.