Not sure I agree with GC's numbers here. I know I certainly can't afford to use Plea all that often.
Illumination 70,000
Divine Plea 50,000
Replenishment 36,000
Other sources of mana 30,000
Mana from gear 10,000
Overhealing 60%
Source
Here's 2 records of me on Mimi:
Illumination 30371
Replenishment 30155
Divine Plea 12122
Mana Restore 9000
Revitalize 2909
Hymn of Hope 1600
Judgement of Wisdom 440
~ gear mp5 / wisdom buff 54000
Overhealing 43.6%
Illumination 42758
Replenishment 27907
Mana Restore 11400
Divine Plea 5738
Revitalize 4606
Hymn of Hope 728
Judgement of Wisdom 175
~ gear mp5 / wisdom buff 54000
Overhealing 56.3%
Here's our primary holy:
Illumination 61560
Replenishment 30165
Soul of the Dead 9900
Mana Restore 4800
Divine Plea 3661
Revitalize 1375
Judgement of Wisdom 88
~from gear mp5 / wisdom buff 25000
Overhealing 61.8%
Now, that mana from mp5 estimate would be if we weren't full the whole time. Generally we both divine plea up to full at each phase transition. So it's probably safe to drop that by 10% to 25%, even then, I'm way different from GC's figures.
Also in GC's thread, if there was confusion, in the next patch Beacon will be able to be applied multiple times to one target.