Personally, i don't care much for the feel of BMW's, they are very stiff, the gas pedal is stiff, the steering wheel, handling etc. same with Volvo's. At least the one's i've driven. My brother has an '04 3 Series Sedan and i hate thing, i really think that BMW's are over priced. But i will say, that they are very reliable cars and are built solid. I have zero experience with Audi's

Now, our crossfire is not a loose ride in any way, shape or form, and the gas pedal is also stiff. However, take a corner going 45-55mph and the handling and the steering is incredibly smooth/no lean ,as opposed to the BMW.

Styling, hands down the Xfire is a lot better looking than the Z4 or the TT. The xfire is smooth, sexy. The Z4 looks like they put it together in pieces, very choppy, and the TT, well, it looks like a smooshed beettle. Like everyone has said, test drive each, base your decision on your driving experiences, either way, you can't go wrong with either of the 3 rides