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: 40 TDI Quattro
The cheapest engine in the A6 Avant range is a 201bhp 2.0-litre diesel, which has enough grunt to haul a fully loaded car with ease. This quattro model has four-wheel drive, although most buyers will be better off with the cheaper front-wheel drive version.