I put a few of the tires mentioned above into tire rack, then sorted by the best on ice. I used the 265/75R17 tire size my 2002 Z71 uses:
Brand Model Light Snow Deep Snow Ice
Bridgestone Blizzak DM-V1 9.6 9.4 9.1
Firestone Winterforce LT 9.6 9.3 8.6
Firestone Winterforce UV 9.5 9.2 8.5
Michelin Winterforce UV 9.5 9.2 8.5
Michelin Latitude X-Ice Xi2 8.5 7.8 8.1
Goodyear AT adventure pro-grade 9 8.6 8
Goodyear Wrangler Duratrac 9.1 9.1 7.9
Goodyear Silent Armor 8.8 8.6 7.8
General AT 2 (not rated for severe snow) 9 8.8 7.8
General Grabber AT 2 9 8.8 7.8
Michelin LTX A/T 2 8.4 8 7.5
Goodyear ATS 7.4 7.3 6.3
Cooper none in 265-75R17 on Tirerack
Nokian none in 265-75R17 on Tirerack
Hercules none in 265-75R17 on Tirerack
Hankook Pike RW11 not on tirerack
Hercules Terra Trac A/T not on tirerack
Michelin LTX Winter
I liked the Duratrac since they have a very open, large tread, good for off-roading as well as snow and ice. I just don't know how well the Blizzaks will work in a foot of snow or more, they don't seem to have a very open lug design......