I checked out all these options over the last 12 months. I was very impressed by Prestige. 4 Brother were also really helpful. In the end I was lucky enough to find a '92 GTS-t at a local caryard which I managed to get for about $14,000. 95,000 kms and completely standard apart from exhaust. It was exactly what I was after and I couldn't be happier. No farken around either, I picked it up the day I paid for it. My advice is look everywhere and don't get overexcited. If you buy the first bargain you see, you may get screwed.
But you have picked a good place to get some tips, because a few people here really know their stuff. (I'm not one of them!)
Good luck, hope to see you out cruising soon!