Warrior Tier 1 – Battlegear of Might
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.
Belt of Might (BOE) – Trash mobs
Bracers of Might (BOE) – Trash mobs
Breastplate of Might – Golemagg the Incinerator
Gauntlets of Might – Lucifron
Helm of Might – Garr
Legplates of Might – Magmadar
Pauldrons of Might – Sulfuron Harbinger
Sabatons of Might – Gehennas