As mentioned above it really depends on what type of snow driving you plan to do. 

If you are talking about icy snowpacked roads it is hard to beat BFG ATs.  I live in Utah mountains and run BFG ATs religiously on the family SUV.  You'd have a hard time finding a better tire for that application.

On the other hand for taking my Toyota out in the deep stuff I'm running 38.5 SXs and they go through the deep like mad.  I'm sure it helps that I'm running a V8 but I can't imagine a lesser tire ripping through the "FOOFOO" powder like these babies do.  They sure flatspot at night but it goes away after driving a bit.