Porsche Boxster vs. Mercedes SLK.

Okay, car fans. Please compare the Porsche Boxster and the Mercedes SLK. I'm just sitting here waiting for my Audi TT Coupe to be serviced. I'm halfway through the lease on this car and browsing around the new car showrooms, wondering, if I'm not replacing my Audi TT Coupe with another Audi TT Coupe, what is my next car? I want a beautiful, exciting car, but I live in Wisconsin, and I need to deal with some ice and snow. The Audi TT Coupe is rock solid. I can't help feeling that there's nothing to compare to it. But the Boxster and the SLK are pretty nice. The Boxster is clearly more beautiful to me, but the SLK has a brilliantly retractable hard roof. The SLK tries awfully hard to get a racing car look to it, but the salesman was clear that it was meant to have less of a racing car feeling to it than the Boxster. So, obviously, the Boxster, right? No, he said that in response to my ice-and-snow question. I sat in the SLK, and I got the feeling it was designed for a much larger, taller person than me. (I'm 5'5".) So... advice?