Hi Paul,
Just coming back to this forum after joining a year ago! You have probably moved on with this by now, but intrigued by your post as to my knowledge, automatic was not available on quattro models in the B2 models. More info on the actual spec of the car you were looking at would be interesting. Engine size, carbs or injection? Were you able to check it actually had 4x4? A year ago, I paid £4,400 for my 1986, 78,000 miles Audi 90, 2litre manual, in very decent condition, 2 owners from new. A coupe quattro in the same condition would have been circa a £2k premium a year ago imho.