If you're that worried get a new set of snows (Dunlop Wintersport 4Ds) from the Tire Rack. You'll be surprised at how good the car is in the snow. The tires make all the difference. I've never had a problem and usually find my car does better than the people driving fwd with all seasons.
135i, SGM, Coral, Sport Package, Auto, Premium Hifi, USB/ipod, Apex EC-7s, PPK Stage II