I just bought, mounted a set of wheels and winter tires for my X from Tire Rack. I only use them for trips up to Utah Dec-Mar.
The cheapest were the 20" Bridgestone Blizzaks. Can't say about the snow performance yet although Tire Rack rated them higher than Pirellis IIRC. But they do sing a bit at freeway speeds. Something the Michelin X-Ice never did; quieter than my all-seasons and grippy. Couldn't get the Michelins from Tire Rack for my X90 or I would have.