hey Steve,
I recently picked up a mint 33 s2 in aus and for peace of mind got a pre purchase inspection which picked up a couple of little things but nothing major.
Like others have said there are so many 33 in aus you just have to weed out the bad ones. troll the fs section and carsales etc and be patient - the right one will come up.
I would however import a more expensive car (r34 gtr) as was mentioned above but 33's are like 10k locally atm.
cheers rich