well, there are a few priests.. But they're HL priests, not melee.
From what I know, I was one of the only battle priests.
You'd need more than one set to change from pure damage to defending. If you try to pvp with only one set, you'd be fucked. You need at LEAST 3 armors, 3 cloaks, 1 shoes, 1 helm, 2 shields.