--This Post is Currently Under Construction--
**updated Dec 31st***
**Currently it seems with the new expansion (WotLK) that Spellpower>Crit>Haste>Int>Sta (We'll need +hit later on, but for 5mans its really not needed)**
With my spellpower at 1250, my crits hit for 6-7K - regular spells = 2500ish (Frostfire Spec) DPS:1000ish while questing 1400-1600ish in 5mans
Soloing is pretty easy with the Frostfire spec (you can take on elites with 5x your HPS that are YourLevel+2ish) [2-3man quests]
The following link is my build on the Frostfire spec (lvl75 req for Frostfire)http://www.wowhead.com/?talent=oZfVc0RhIuVubhstbIccoc
The following link has a great pre-raid set of gear to work towardshttp://elitistjerks.com/f75/t37146-best_non-raid_mage_gear/
Oh, and my favorite new addition to gear enchangements is the Belt Buckle -- adds a socket to any belt -- even one with sockets already in it!
Just making an addition. Been a couple weeks and my spellpower now is upwards of 1600ish raid buffed. But, more importantly to me my crit bonus is 37% raid buffed. I've seen alot more out of my crit bonus than my spellpower in the runs I'm doing. Just a note for all you up and coming mages out there. Some good crit trinkets to be had, badge gear - quest drops etc.
P.S. I would like to acknowledge Elitest Jerk's Webiste with most of the above information