Meh, with the right gear, I think I would be able to kill a blizz sorc. Hmm...lets see....(dream gear)
Charms:
10 P/B Charms with 35+ Life
Perfect Resist Annihilus (20 Resist)
9x 5% FHR / 11 Cold Resist Small Charms (99 Resist)
4Sapphire monarch (160 Resist)
4Thul Armor (120 Resist)
3Thul Helm (90 Resist)
2x Ravenfrosts
Wizardspike + 30 Resist Cold Jewel (105 Resist)
Perfect Magical Sapphire Boots (40 Resist)
Perfect Magical Sapphire Amulet (40 Resist)
Snowclash
Total Resist: 20 + 99 + 160 + 120 + 90 + 105 + 40 + 40 = 584 Cold Resist, + 40% Absorb + 15 Absorb.
So, a Level 40 Cold Mastery + 4 Facets = 215 + 20 = 235% - Enemy Cold Resist
After Cold Mastery
584 - 235 = 349
After Hell Resists (of a possible 195 needed)
349 - 195 = 154
154 Resist is what you'd be facing, if I'm thinking right. That's factored everything out of the blizzard, so doing 15k wouldn't do too much, not to mention 40% absorb + 15 Absorb would probably heal you. I would do the calculations, but I don't know them.