Spell damage is, in my opinion, the most important raid attribute for a mage, followed closely by spell hit and spell critical strike rating. If you are having mana consistency problems, I would suggest making appropriate changes in your talent build to help with this. Also, while it may be expensive to buy the high end mana potions, I would suggest spending the money anyway and burning a potion as soon as your mana is low enough that you aren't wasting. Then, by the later part of the fight, the cooldown on your potion will be up and you can get two per fight. You will also presumably have evocation and a mana gem for each boss fight as well. With the two available potions, the gem, and evocation, you should be more than fine on mana. It is also worth noting that additional damage indirectly increases mana efficiency as it will take less spells to kill your opponent. I am in no way saying that this indirect help rivals pure mana regeneration attributes, but it does help some. For a mage, though, I believe that all gems, enchants, etc. should help with your damage, crit, and hit ratings while your talent builds and proper potion usage should get you through the boss fights. The popular 10/48/3 raiding build is probably the way to go as far as mana consistency while maintaining high damage output. I hope this helps.