I've never seen the reason for buying an Audi.
Take the A3 2.0T. Why would you buy that over a Volkswagen GTI? The engine is the same kind, it has the same power, the car is roughly the same size and it's basically as much fun to drive.
But the Audi is about seven grand more than the VW. And for what exactly? The badge, obviously.
Audi is the new BMW. It's official.
I'm pretty sure people have forgotten that Audis are dolled-up versions of VWs, in the same way that Lincolns are typically Fords in heavy makeup and Acuras made up from bits and pieces from the Honda partsbin. And there are a ton of other examples.
Don't get me wrong, a Vee-dub is great place to start. In fact, I can't really think of a bad Audi (oh wait, the Q7, which looks like it was modeled after a whale). They're all pretty good to drive, look good (Q7 excepted) and have some of the best interiors. In fact, they're better all-around than most offerings from the other Germans, let alone cars of other nationalities.
Audi would like you to think then that if you want to stand out from the mass of propeller badges, three-pointed stars, and slanted Ls, buy a car with four rings on the grille.
They've succeeded. Because if you're doing about 80 in the fast lane, there's going to be a spikey-haired boy in Oakleys in an A4 trying to race you. So you move to the next lane and get in front of a TT, which is angry that you're only going 10 mph over the limit.
Moral of the story: if you want to be different, buy a BMW. You'll end up with an ugly car though. So you could just by a VW. But then you're friends will think you couldn't afford an Audi.
I guess I'm safe with a Saab for now.