ummm last time i looked r33 gtst boxes were like a 1k or bit more? plus fitting and everything will add up to 1.5k
There is also the problem of buying second hand boxes knowing if they are stuffed or not too.......i bought a used box once and one of the syncho's was ****ed as well as the bearing was leaking oil onto the clutch and rooted that too.
I know you have been looking for ages blx, but surely theres quite a few r33's getting around now. I would advise you not to get this car as other people said in the other post, a stuffed gearbox usually means its been thrashed and who knows how well the engine has been looked after? i mean they are strong engines but not bulletproof.
Get another one unless you can negotiate the price really good. I know how hard it is waiting, but make sure you get it right the first time, you dont want a car with problems niggling at you everytime you drive it.