i`m new to the forum (member wise) been reading here for months tho.
Seen alot of people that wants a possibility to see how mutch disc benefits the raid, taken in mind:
Power Word: Shield, Rank 14 (Holy)
Inspiration, Rank 3 (Holy)
Divine Aegis, Rank 1 (Holy)
Here is a "Event Horizon Fight Statistics" report (http://aukra.org/fight_11_healOverview.html) we had some attemts on Iron council 25-man Hard-Mode.
Hope this helps.