I bought the nokian mount and ground studded tires. They're excellent! Quiet on dry pavement, I haven't lost a single stud, and I've put over 600 miles on them. I'm riding through the winter, it's nice to not worry about black ice. Yeasterday I rode 5 miles through a pretty nasty snow squall. If I had my regular tires on, I would have had to stop.
Well worth the 56 dollars each.