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
The sporty S6 is fairly well equipped, with 20in alloys, privacy glass, keyless start and leather seats (heated in the front) fitted as standard.
Engine: S6 TDI 349 Quattro
A bespoke sporty version of the A6 with an even more powerful diesel engine than the 50 TDI. It's pricey, though.