Agility > Versatility > Critical Strike > Mastery > Haste
As always for your stats, enchants and gems: Some of them might be better than others depending on your gear or talents. Make sure to always sim yourself if you want to know the best combination for your gear.
Agility: Provides Attack Power which increases the damage you do.
Haste: Increases attack speed and Energy regeneration, reduces the cooldown of spells like Rising Sun Kick or Fists of Fury, and increases the chance for Dance of Chi-Ji procs to occur.
Versatility: Increases damage done and reduces damage taken.
Crit: Increases the chance of your spell doing double damage. Does not affect the damage from Touch of Death and Touch of Karma.
Mastery: Increases damage of abilities that are not a repeat of the previous cast. Note, this also affects the damage of Touch of Death.
The best way to calculate stat priorities for your character is to "sim" your characterFind out how to sim
Races are within about a 1% DPS margin which means it doesn’t really matter what race you play. With that said there are a few races that have utility benefits that may be useful in the content you are doing such as Dwarf’s Stone Form, Blood Elf’s Arcane Torrent, or Orc’s Hardiness.
Rings: Devotion of Versatility / Devotion of Critical Strike
Chest: Waking Stats
Cloak: Writ of Avoidance / Writ of Leech
Bracers: Devotion of Avoidance / Devotion of Leech
Belt: Shadowed Belt Clasp
Legs (ST): Lambent Armor Kit
Legs (AoE): Fierce Armor Kit
Boots: Watcher’s Loam
Weapon (ST): Shadowflame Wreathe
Weapon (AoE): Sophic Devotion
Critical Strike and Versatility Gem: Radiant Alexstraszite
Primalist Gem: Resplendent Illimited Diamond
Food: Grand Banquet of the Kalu’ak or Fated Fortune Cookie (If Grand Banquet of the Kalu’ak is not available)
Potion: Elemental Potion of Ultimate Power
Phial: Iced Phial of Corrupting Rage / Phial of Tepid Versatility (if you need a tankier option)
Health Potion: Refreshing Healing Potion
Weapon Enhancement: Buzzing Rune