I've run Blizzaks and the Cooper M&S studded on my 100 as snow tires. The blizzaks are initially better due to the soft rubber compound, but they do not last to long due to this as well. The one's I had were also P rated and smaller than the 33" I run in summer (have OME MD kit). You can get the Coopers in a full 33" size and they are snowflake rated without the studs, the studs just make them better on ice. You can go with any snow tire you want, but I would recommend going with a specific snowflake rated tire, not an AT tire that can be pinned for studs and then aftermarket siped. I've researched this extensively and come to the conclusion for MT (I also travel to Butte for work at least once a week) that a full E rated, studded, snow specific tire works best for me.