Finally, the range-topping 2013 Audi S6 model is powered by a 420-hp twin-turbo V-8 that propels the sedan from 0-60 mph in a little over four seconds. The 2013 Audi A6's turbo-four is now ...

Z06 and dip into six-figures, what else could you buy? Could you find something cheaper, better-looking, and more fun?