Second for the Pirelli. It seems to fit the gap between all out snow performance and marginal clear road performance of the Blizzaks and the more clear road focused, but worse snow performance of the Michelins.
2013 328i MSport
2012 X5 50i (returned due to PCS move)
2008 M5 (traded for X5)
2004 330ix (former winter beater)
2003 M5 (traded with 103k, still working fine)