A few RL friends and I are thinking about starting a static group to level with, the purpose being to AoE grind instances. Our setup would be prot pally, resto shaman, shadow priest, warlock, and mage. The lock and mage would be AoE, the shadow priest a mana battery, and the shaman and pally healz and tank.
Every other class, except the mage, I have a pretty good idea of how to spec. The mage, on the other hand, has AoE potential in all three trees. For the most part, mana shouldn't be an issue (considering we'll have a resto shaman's mana totems and a shadow priest both providing huge amounts of incoming mana), but even so if certain specs would be uber mana inefficient I would like to avoid them.
That being said, I come here asking for a decent AoE DPS spec. I know frost is usually the AoE grind set, but as there will be a tank absorbing all the damage, the control of frost is not necessary (but it wouldn't hurt, and if there's a lot of AoE DPS there then kudos to frost). So what should the mage spec into?