A lot of Continental DWSs owners say good things about their light snow abilities. If you live in a relatively temperate climate that gets an occasional light snow...and you rather deal with just one set of wheels/tires...you might want to consider these tires (or look into them to see if it something that fits your needs).
They rank at the top of the list on TireRacks Surveys of Ultra High All Season Tires:
http://www.tirerack.com/tires/survey...jsp?type=UHPAS