Arms Warrior Best in Slot (BiS) Gear List - MoP Classic
Class
Spec
Phase
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Gear
Slot
Source

Reinforced Retinal Armor
head
Crafting
Engineering

Ferocious Necklace of the Golden Lotus
neck
Quest (The Golden Lotus - Exalted)
The Final Power

Acid-Scarred Spaulders

shoulder
Gate of the Setting Sun
Striker Ga'dok

Cloak of Failing Will

back
Temple of the Jade Serpent
Sha of Doubt

Ghost Reaver's Breastplate

chest
Crafting
Blacksmithing (Pre-Raid)
Commanding Bracers
Bracer - Exceptional Strength
wrist
Scarlet Halls
Houndmaster Braun
Ghost Reaver's Gauntlets
Gloves - Super Strength
hands
Crafting
Blacksmithing (Pre-Raid)
Binding of Broken Dreams
waist
Temple of the Jade Serpent
Sha of Doubt
Pyretic Legguards
Angerhide Leg Armor
legs
Scarlet Halls
Flameweaver Koegle
Anchoring Sabatons
Boots - Pandaren's Step
feet
Siege of Niuzao Temple
Wing Leader Ner'onok
Seal of the Bloodseeker
finger 1
Quest (The Klaxxi - Exalted)
Shadow of the Empire
Blade Trap Signet
finger 2
Mogu'shan Palace
Xin the Weaponmaster
Relic of Xuen
trinket 1
Crafting
Inscription
Lessons of the Darkmaster
trinket 2
Scholomance
Darkmaster Gandling
Mogu'Dar, Blade of the Thousand Slaves
Weapon - Dancing Steel
weapon
Mogu'shan Palace
Xin the Weaponmaster
Stat Priorities
Hit (7.5%) = Exp (7.5%) > Crit > Mastery > Haste
These are general guidelines. Always sim yourself to get your own stat prios.