I made a list of how much artifact power is required to unlock all 3 "Gold Dragon" abilities for each spec. This is taking the fastest way to get all 3 unlocked.
Here's how much AP you need for each spec:
330,910 Guardian, Shadow, Elemental
253,690 Discipline
195,210 Frost (DK), Mistweaver, Outlaw, Resto (Shaman)
150,530 Beast Mastery, Brewmaster, Retribution, Destruction
116,565 Arcane, Holy (Priest), Prot (Warrior)
90,715 Vengeance, Balance, Feral, Survival, Windwalker, Holy (Paladin), Prot (Paladin), Assassination, Enhancement, Demonology
71,115 Druid, Blood, Unholy, Resto (Druid), Marksman, Fire, Frost (Mage), Subtlety, Affliction, Arms, Fury
55,715 Havoc