The 2003 model uses VAGs PD injection and I think is worth 180bhp. The V6 engine is silky smooth but it's not torquey in the way that a four cylinder unit is. Personally, I'd have one at the right price and get it remapped to realise the midrange torque than only good diesels can offer. It'll probably shove the bhp up past 200 as well.
Very nice motors, with plenty of tuning potential. I nearly got an A3 Tdi Quattro but they are really rare and were a lot more expensive. The low down torque works particularly well with the quattro drive system and leaves you with a car that is faster than pretty much anything else in the wet, and still pretty quick in the dry.