Oof...defiler is a tough class to AA spec for effectively. Common thought is to go down the STR line under the Shaman AA to get the good group haste, a ward proc for your pet and the AE immunity that increases your pet's survivability by many magnitudes. After that it's up to your own taste. I went INT, personally. As for the Defiler specific AA, I like the left track of the Soul Ward line and I like most of the Canni line (especially enhance Maelstrom). Hope this helps.