I currently have an A3 Sportback 2.0T Quatto and it is a very nice bike friendly car without being a full on estate although it is not really a looker. Before that I had a Golf Mark IV which was very well built and high quality materials but was a bit of a dull drive.
I had major problems with the cooling fans on the Golf – but they were specific to my model. Other than that no problems with the Golf or the Audi
I briefly considered the A4 Avant but it seemed too big for me and quite a bit more expensive at the time after far too many years driving golf sized hatchbacks.
I just could not get on with the older VAG disiel engines (nothing better than a tractor IMO) compared with the common rail BMWs. I would now be tempted by an VAG disiel but not sure how far the new common rail engines have filtered down across the range.