I'm interested in buying a 911 for everyday use and I'm leaning towards the C2. But I'm concerned with slippery weather and whether I should consider a C4s or not. I want to keep the car for a long time and I don't want be sorry for not getting the C4 when I'm in slippery or winter conditions later. Does the C2 do well in slippery weather if the tires are changed out for all season tires especially with the new 2005 Carrera S?