I'm saving so much for a whole host of reasons:
I'm fairly conservative
I don't want to work forever
I didn't start earning until 35, so my number or earning years is fewer
My monthly loan on the longest repayment plan is 1200, my rent is 2000, and I'm an academic, so do the math.
Do I need a car > 30K? absolutely not, and I totally see the point. It's something I always looked at as a sign of success. As I've gotten older, some of those things I've always thought were important turn out not to be so. But I do like to go really fast and bend hard into the turns. Really hard.
And in SF, no matter what I do, I'll never be able to own a home, so once you accept that, you have a little money to piss away on a car.
Pro, a friend of mine just did the European delivery on an A4 and he really enjoyed it.
I like the TTS, but, having had a 2-door car before, I really like the 4-door.
An alternate idea was that I'd maybe keep the Mazda but get a 2nd car, like a 70s or 80s Porsche 911, or some kind of fun, beat-up convertible to fart around in. Like an old MG or something.