I play with MS (lvl 780) sometimes and i like more with Mana+Critical, because I already have ML on helmet and this weapon is giving you a lot of damage because of the chances of critical, plus there's the damage spell.
Even if you work a lot with ur mana, is one more extra thing you need to check, and nowdays sorcerer does a lot on the hunt: 4 spells of damage, spells to increase damage, Uh the friend dying and the mana will be one more concern.
I always feel more comfortable using mana leech than magic level.