Because I don't know what you are planing to use this Sorc for I will list what I see most on USWest ladder.
1. Blizzard
2. Blizzard
3. Blizzard
4. Blizzard
i just started my new sorc, i had a fireball/frozenorb.. wasn't satisfied!! so i started a new sorc with blizzard/chainlightning!! i use the chainlightning because i heard it works good in pit runs.. and this sorc is gunna be mfing so i gave it a shot!! only lvl 72 right now so she's not quite maxed... well blizz is maxed just putin the other synergy's in now.. >.< my blizz does about 3-4k dmg right now, and my chainlighting is around 1k