Versatility: increases the damage that you deal, while reducing the damage that you take at half the rate.
Critical Strike: makes your abilities do double damage.
Haste: increases your attack speed and energy regeneration.
Mastery: increases the damage done of your finishing moves.
The best way to calculate stat priorities for your character is to "sim" your characterFind out how to sim
Night Elf > Void Elf
Undead > Blood Elf
Main-Hand - Deadly Navigation
Off-Hand - Versatile Navigation
Rings: Accord of Versatility
Gems: Versatile Dark Opal