Hey Mike,
I kinda get where your coming from on this as I had an Audi A4 1.8T Quattro Sport. Ok not the quickest thing around (180BHP), but OMG what a fantastic car. Also very tunable and such a Q car.
Not sure about the 3 Litre what with fuel cost etc, and the extra weight. If you insist on an Audi mate go for the 1.8T or 2.0T. Less weight, more fuel efficient and limitless tuning possibility..................
All said and done though Mike, it's not a GTI