215/60-16 sounds like a decent size if the rim is 7" or narrower.
When running a snow tire you want a narrow tire to avoid flotation and increase contact pressure.
Nothing sticks to snow as good as... snow... keep that in mind when looking at tread patterns.
Bridgestone was the first to use snow in the tread with the Blizzacks, and now Michelin, Goodyear BFGoodrich etc., all make a similar tire... and they plain work.