warlocks and hunters. Hunters do really good damage consistently on all fights, they don't get interrupted on Thok and usually win the meters there, they have no movement penalty so are always able to keep up damage, plus bring any missing buffs needed. Warlocks just have great survivability and damage, plus gateways and useful symbiosis.
Rogues for melee, for high damage and for smoke bomb.
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why is your guild looking to recruit a hunter then?