Of the 9 European cars Ive owned, the 94 Audi 100cs Avant wagon is by far my favourite. I paid $7,500CAD in September 2003 with 198,000 km (118K miles), from my local independent Audi/VW garage. Since then, Ive clocked 80,000 km of relatively trouble free miles with the exception of front end suspension work, thermostat replacement and brake work ($1900CAD), all common repairs for any high mileage used car. As typical of late Audis, the body and paint are solid showing only superficial rust - not bad for a car thats seen 14 years of winter road salt. As for performance, its no rocket off the mark, yet at highway speeds of 160 km, its like driving on glass - yeah it's all about the Quattro!
Quattro, the best handling car save rear drive BMW M5. For this reason my teeenage sons would rather drive the Audi instead of their mom's Saab 9-5 Aero. Bose audio system is awesome, it's set up perfectly to the wagon and let's not forget Audi's fit and finish: it's second to none.
Manual tranny for the A6, although the newer Audi bi-turbo Allroad does offer a 6 speed.