My guild did hard mode Vezax tonight, and while I had enough mana left to burn down the Animus, that required me to do a large amount of wanding throughout phase 1, and after the Animus was dead.
I did the fight as 3/14/54 (my 10 man spec, as we don't have a moonkin/spriest for 10 mans). I also tried it as 0/13/58, but since imp SL doesn't work on Vezax that was kind of pointless.
Does anyone have any advice on a particularly mana-efficient spec for Vezax? I can't think of any spec that has especially cheap spells, etc.