In case anyone wants to know a good combination of snows for a 300m:
Front: Cooper Discoverer M+S 215/70 R 16 Rear: Bridgestone Blizzak WS-50 205/70 R 15
This will be the third or fourth season for that combination. The front shock tower guard clears the Cooper's by about 1/4 inch. The Coopers are technically an SUV/light-truck tire.
Yea, they put the speedo off by a little, but they've also pulled me down some roads where the snow was so deep it was scraping the bottom of the car (and I took my front air-dam off a few years ago).
Still running on the original battery. 10 years 1.5 months old and still crank'n.
No snow on the ground around here yet. Been really lucky that the lake-effect snow has totally missed us.