my experience...
...I just couldn't pass this one up without posting a followup: I own a '97 A4 1.8t, and I've put 87k miles on it. I've owned it since it was new, and I've taken exteremly good care of it and followed the regular matience schedule. Currently, I have ZERO boost coming from the turbo charger, and no body can seem to figure out why. I've had it in the dealer twice now, and I'm taking it back next week. My last repair bill was approx $2500 when I had the dealer replace the timing belt, heater core (which was leaking), water pump, and breaks. I love my car, I love driving it, I love being seen in it. Overall: it's an awesome car. However, if you are considering a purchase, know that Audi owners require a lot of money and patience.
Good luck!