Hey mate, well you could go for a bolt on gt-rs turbo which looks stock enough and makes great power!
basically you buy an rb26 for 4grand (maybe more) you dont know how long its gonna last where a new forged motor is almost new and tough.
gt-ss or 2860-7 or -5 are 2500-3000 + dumps and fronts
Think about this then; i got a quote from rajab racing in 2002 for $14,500 for a full rebuild with ball-bearing turbo, forgies, turbo rods, injectors, fuel pump, turbo coils, front mount ic, dumps and full 3inch exhaust.
All labour included and tuned with a Motec.
now thats a big dollar figure considering r33 gts-t are going for around that price now!!!!
Now im thinking: sell your car and buy the turbo model because although parts have come down alot you'll still be looking at past 10k and thats just not right.
But then again if you buy a gts-t; then it will be probably stockish with zorst and cooler