Under 6g's, 30 MPG+ highway, fun to drive, AWD

Yea that seems to be the big issue. I could probably get a 1.8t A4 to cover every criteria except reliability. And a V6 A4 sounds like it will get pretty terrible gas mileage. 2.5RS is a bit too boy racer style for me but at the moment it looks like it might be the best choice.