i just bought bridgestone blizzak WS50s for my tour, they're pretty nice.
However, I had Michelin Arctic Alpins on previous car, it had LSD so might have made a difference but they're awesome. i think the Pilot Alpins are the same thing, they just changed the name. costs a little more than blizzaks but i think worth the money. Next time around i'm going to go back to the alpins.
check out
www.tirerack.com, they have a bunch of reviews which i based my decision on.. blizzak's were among the top so i went with those.
you might consider Studded though since you prob have a lot more snow..