Would such an investment in ES work for a Melee sorc - well, for a Kingslayer one, actually?
The main problem with ES Melee Sorc are the mana burn monsters, which exist a lot in Hell difficulty. Even with a huge mana pool, a simple stike from one of these will drain all your mana!...
I think mana burn its bugged since it dont work like it's said in Arreat Summit (somethink like 2x the monster's damage, i think).
A kingslayer sorc with points in the masteries and enchant should do some crazy damage with vengeance!....