assuming mana is NOT an issue, i was thinking this might be a decent spec. if not then the good ol' 14/0/57 would be better.
http://wotlk.wowhead.com/?talent=bVM...ZGcfMowzcVqVzi
Also, twisted faith says it increases MF/MB 5% for each shadow DoT on the target. This would include devouring plague, and make them buffed 15% for the duration, correct?