The best sorc hands down is a orb/firewall sorc.. hell trav you kill all the high council but the one that is cold fire immune, use static to 1 hit
then hire a light merc to finish the job or telekenisis him till he pops
cheers

go both.....
Ice bolt - 5
Orb - 20
Cold mast - 20
Firewall - 20
Warmth - 1
Fire Mast - 20
Tele - 1
Tele - 1
Static - 1
Shield - 1

90 skill points minus the 4 skills per difficulty (12)
Lvl 78
55str (mage plate)
rest into Vit