I haven't played in a quite a long time and have never spec ed cold before so i have a few questions.

I need to know what the best spec for a mf sorc is. I have ok at best gear and lvl 73 so i will have to farm nm for a while.

I was also wondering how good orb and how good blizz spec is for mfing nm and also if it is good for hell.

And one more thing, if i wanted to go with a cold spec for nm mfing, what spec would be best?

Thanks in advance!

In my opinion, farm hell glitch Andariel + Mephisto with either a pure blizzard sorc, or an hybrid frozen orb / fireball.

Random items like spirit sword, lore helm, stealth armor...

Merc with Insight in random weapon.

1 static / 1 warmth / 1 teleport / 1 cold armor

20 cold mastery

either :
20 blizzard + rest of points into synergies (Glacial spike first, have it on left click)
or :
20 frozen orb, 1 fire mastery, 20 fireball, rest into firebolt (Glacial spike again on left click).