I know the question wasn't asked of me, but take a peek at this site. http://www.peterwhitecycles.com/studdedtires.asp It's got a fairly decent amount of information about studded tires.

I've been using the 700c Nokian Hakkapeliitta for two seasons and really like them. The only time I wish I were riding something much wider is when I'm dealing with plowed road slush that has frozen over and have a very uneven/rocky kind of surface. Fortunately, I'm usually able to avoid this.