What's the groupthink on snow tires for the DC region? I've got the 19" Michelin all-seasons, which were fine last year, but we got essentially zero snow. I'd rather not drop $2500 on a set of wheels/tires if I don't have to, obvs, especially since we often get little or no snow, but then again it seems dumb to nickle and dime over a set of snow tires in a car like this. I've run snows on a variety of RWD BMWs over the years, but those cars were running summer rubber that was useless in the cold. I've got an AWD second car which I can use during really bad snow dumps, but can't really get by with just one car if the snow lasts for very long. Anyway...opinions?