Greetings!

Been dual-boxing for daily quests and primal farming on my hunter and priest for a little while now, and my boyfriend has started dualboxing for the same on his mage and priest. Being that together we're 2 healers and 2 dpsers, I'm contemplating getting a third account for a tank. How bad would it be to break the 1T, 3D, 1H rule for us and does anyone have a recommendation for which type of tank I should go for? I was thinking a warrior might be easiest since I can have him charge ahead, but then again, pallies have aoe tankage down. Keep in mind that we'll have 2 healers and will be a hair bit short on dps.