I'm considering getting new winter tires for my MB. However, around the Philly area, we have days with black ice or just slick plowed roads. It's usually dry, so to help avoid lower rolling resistance, I thought about getting a set of Conti Top Contact winter tires.

Do the Conti's provide enough grip on ice, or should I just get a set of studded Nokian (Mount & Ground 160s) or Schwalbe Marathon Winter tires and crank a little harder when it's dry?

Your thoughts???