Defiler or Inquisitor - Inquisitor I'd guess (reactives > wards for a tank with low avoidance)Better though for a duo would be Fury - INT buff, and enough heals for a duo anyway, or ignore priests and get a class that fits better - Dirge or Enchanter. Dirge for disease damage/debuffs and power, Enchanter for a lot more power and stuns/stfiles/mezz so you don't get hit so much.