I've been searching around and so far I have not found any solid information on this. Even the great Elitist Jerks does not have these numbers yet.
Personally I have been going for Hit > Mastery > Crit > Haste (Int being a no brainer). My reasoning behind this is as follows: the burn phase which lets you stack 4 AB buffs, gives a total of 52% dmg increase once stacked to 4. And after that you will spend most of your time close to full mana until Evocation is up again and you can burn again. Obviously Mastery would not beat AB spam until you get more than 52% bonus, currently at 1448 mastery rating I have a 24% damage increases o this is most likely never going to happen.
However, I am finding it hard to do anything more than 3x AB > AM/ABr in raids because otherwise I lose my mana faster than I gain it, and even then I sometimes have to resort back to 2x AB > AM/ABr. This is with Mage Armor up & glyphed. If I were to stack haste, I would have to resort to even less AB stacks because I would be casting them faster, meaning I would burn my mana even faster, causing regen issues since Mage Armor is every 5 sec.
So currently I value Crit above Haste, since it increases my damage at no penalty. Once I have more mana I will also regen more, since Mage Armor is a static % and AB mana cost will not change anymore (the idea being 80k mana = 2880 per 5 sec but 100k mana would be 3600 per 5 sec allowing for more AB stacks).
So my idea is to keep stacking Int & Mastery & Crit until I can do 3-4x AB > AM/ABr and then start bringing in some haste so I don't get stuck with too much regen.
Any thoughts on this?