[Paul B.]

I don't know what girls like in terms of performance/luxury, but if I were to make a guess I would think they prefer luxury. (If I'm wrong, definitely go with the M3/M5)

I've driven all the cars on your list except the M5 and A6, which I imagine are identical to the M3 and A4 respectively, and I'd recommend a 5-series. It's a really sick looking car and it drives incredibly smooth and fast.

And as far as driving in the winter, you can just put a set of Blizzaks on any car and it'll be fine in the snow.