non got a mana issue as long as u don't try to put cleansing flame on all rival raid...

(which i also tried for the reason of keeping deter up passively and stuck all stat on deter. forget it - waste of time).
mana is definetely not a issue with CH: after 1 week i changed my build and took off the rubies which preserve 15% of the mana. its not needed and u can handle ur mana quite easily with pots/martyr.