Priest Tier 1 – 
Vestments of Prophecy
This tier drops entirely in Molten Core. Some pieces are BOP while the two pieces that drop on trash are BOE so you can check the AH for a couple of the pieces.
Boots of Prophecy – Shazzrah
Circlet of Prophecy – Garr
Girdle of Prophecy (BOE) – Trash Mobs
Gloves of Prophecy – Gehennas
Pants of Prophecy – Sulfuron Harbinger
Mantle of Prophecy – Magmadar
Robes of Prophecy – Golemagg the Incinerator
Vambraces of Prophecy (BOE) – Trash Mobs