Mate, i owned a stock R32 many moons ago and all I did was spend spend and spend - get a modded car with plenty of history and care. Like the V-spec above (I havent seen that car but has some tasty mods and its a VspecII)... I bought a Racepace worked R33 that was immaculate for around 30k - the engine build and power support mods cost nearly that alone! GTR's are a bargain but it anything goes wrong expect to pay huge $$$$ to fix + maintenance isn't cheap... that said I LOVE my GTR!!!
If you're going to drive it hard start saving for an engine build too...
PS - Racepace inspection is a must for any purchase! Ideally you'd let them maintain it too...
That's my 2c for the day