I'm a big Audi fan who's owned C5 A6's (non-avant) and some of the older 90Q cars. Audi builds a VERY nice car but can be quite complicated to work on if you plan to wrench yourself. Buy a very good set of repair manuals and prepare to buy/make specialty tools.

What engine platform are you considering? Auto or manual? If it was me I'd find a manual tranny. Stupid fun car, especially in snow.

And the resale value on the newer Audi's is excellent. They seem to hold their value a little better than most european cars.