A good friend of mine has a `94 (I think) A3 Golf TDI. Yes, you read that right. It started life as a gasser, I believe, but the TDI motor has been transplanted completely the right way, full electronics, drive-by-wire throttle, etc., etc. The owner, who also did the swap, is the head technician at Woodstock VW and someone I consider THE Diesel Wizard.
When I last talked to Gerry, the car was just finished and licenced, but he's unsure if he'll keep it as he has a burgeoning fleet in the household and yet another new car in the stable (insurance for a two-person household with like 4 or 5 cars, all VW Diesels, gets expensive...)
He also built up a totally customized A1 Caddy with a crazy TDI engine that did a 113 MPH pass in the 1/4 mile a few months ago. That's his baby and his toy, and I'm looking forward to seeing that Caddy breeze into the 12-second E/T range next season when it can actually hook up.
I donno if this Golf TDI will be in your budget, nor if he's even committed to selling it, but if you're interested, contact Gerry at gdewit at sympatico dot ca and tell him TDIMeister sent you.