No Magic Resist is a bad idea for a Mage, IMO it's a bad idea period for pvp. I suppose I'm just oldschool though, I have used, and continue to use, the same mage template since I started to PvP.
120 Magery
120 Meditation
120 Eval Intel
120 Magic Resist
120 Wrestling
100 Inscription
Sometimes I'll switch it up and go with 100 Poisoning vs 100 Inscription, but it depends on the situation. (will I be dropping mad poison fields? Yes... go with Poisoning, No? Bonus SD wins.) If I'm dueling, I always go with poisoning.