The Audi A6 Avant is a comfortable, quiet and technologically advanced estate that's beautifully built. A BMW 5 Series Touring is better to drive and has a more user-friendly infotainment system, though.get the best price
Range-topping Vorsprung trim is ludicrously well equipped, with whopping 21in alloys and a panoramic glass roof fitted as standard. It's very expensive, though, so we'd stick with Sport or S line.
Engine: 50 TDI Quattro
This 3.0-litre V6 diesel generates a huge amount of shove from relatively low revs. It's effortlessly quick on the move, so is worth considering if you have deep pockets.