I'm Defense capped, I've got pretty good avoidance, I never have any issues with threat even with 5-6k DPS from Rogues, but I often have issues with running out of mana.
Here's my armory
http://www.wowarmory.com/character-s...l&n=Chatterley
When ever I do dailies or even sometimes during Heroics and Raids I'll swap out my shield for my healing shield which helps with my mana issues. http://www.wowhead.com/?item=40401
I always have Divine Plea up and I even judge wisdom.
Any one else have similar issues?