^Pretty good breakdown Bullfrog. Also forgot to mention the Audi has a longer warranty, gets better gas mileage, and the biggest factor why i would choose it over the crossfire is it has an aftermarket. Small also, but at least it doesnt cost 10 grand to get anything over 50hp. Please don't bring up nitrous, thats not an option. Other than that pretty well said.
In the audi defense the ALMS Audi TT looks good, and out peforms the XF. If I remember correctly didnt they band the TT's quattro from some series of races? No car could keep up with the audi in the twisties but it was always reeled in by the likes of the C5-R and viper gts-r.

Oh I never said anything about since its a luxury brand it will hold its value better, just said I would choose it because of the name alone. Along with all the other attributes.