2001 Audi A6 2.7T Quattro AWD 4dr Sedan (2.7L 6cyl Turbo 5A)
We have the six-speed and there is no hint of turbo lag. I get 23+ mpg on combined city/highway driving (probably because I don't always drive like I have something to prove). Acceleration is amazing when needed, and the engine picks up anywhere from 1.5Krpm upwards in any gear. we got the sport suspension and sport wheels, which means I can go around corners practically with no braking. Saves wear and tear on the brakes and gives the kids a thrill :-). The stereo (Symphony) is excellent. Bought it used with 51K mi for less than 17K$. Try getting something with the feature set (Xenons, auto-dimming mirrors, power heated leather ...) in other brands for anything close.
Acceleration, cornering with sport suspension, sport seats, looks quiet too (wolf sheep ...), 6M transmission, airbags all over.
Nothing yet, but I haven't had to do any repairs so who knows!