Winterforce are great and cheap. WS70, PA3, SottoZero 2, or Wintersport 3D if you want a sporting tire.
You might also want to check out Nokian WR or WR2 if you want an all season with severe winter rating (aka the "snowflake"). They do a great job and are in between a winter and A/S tire as far as compromises.
| '13 328i M Sport - Estoril Blue | '12 300C SRT8 | '12 Wrangler Rubi Unlimited - COD MW3 Edition|