Hankook W400 - 235/45-17
By the time I decided to buy snows, there was little choice left. The price was right too- $600 installed. After 2 winters, there's still 50% left, and I really can't complain about the performance. Unbelievable difference compared to the all seasons, even in light snow. You can still outdrag front drivers with snows too, albeit only by a little. Changing lanes through slush at 130kph - no problem (at least with traction control on).
I recommend them.
E39 528i Touring - Unicorn Package (5 Spd M)
E39 M5 - for Sunny Days