Ok ok, I have the Pirelli Snowsport 240 N rated. Love them, they look good.... not too winter tire-like (if you know what I mean

) and the traction on snow, ice and mountain roads is really good. I live in Switzerland and drive my Boxster S also in snow.
Don't know the Conti's personally, but I see them a lot here in CH on Porsches in winter, so they must be ok as well...