Going through the process of gearing my guys up at the moment. Armory here:
http://www.wowarmory.com/character-s...ammert%C3%AFme

My main is prot spec, and he is ALWAYS the last to die when I get zerged, it's crazy how long he can last. If I really want to annoy people, after Ardent Defender procs, I can use Lay on Hands to heal to full, then bubble when I'm low and heal to full again.

The other great thing about having main as prot spec is Avengers shield. Not only is it good for closing distance on runners (mainly for getting into range of repentance), but the silence effect is great for shutting down druids / locks / mages who try to AoE your group down.

Cheers,
S.