We are trying to figure out what specs to use in-between patch and WOTLK. We are going to continue raiding. Does Torment of the weak proc for all mages or just the mage that casts it? We are thinking of one of us gong arcane and the others going fire. Frost doesn't seem like it will do enough damage to be good at 70. I haven't had mana issues on the PTR with either arcane or fire, but the fights are going so quickly that the dps from arcane seems better to me since the ticks are ticking all the way for fire. I still have my 2 pieces of T5 for the 5% bonus and with them lowering the mana costs Arcane is attractive to me, at least until I start leveling again. I'll be frost for leveling.
I'm thinking of going:
http://wotlk.wowhead.com/?talent=of0ifz0IzxGuGtxdc