If you want to play a primary healer, it is best to play as Monk Primary. Nothing beats divine favor, really. You could arguable use E/Mo for the energy storage and use more heals before you burn out... but you will still run into energy/recharge problem if you spam the heal too much.
Casting speed doesn't seem to be a problem to healer, so for primary healer, definitely choose Mo/Me instead of Me/Mo. You could even try a pure monk and go Smite/Heal, and I'm sure the people in PvP will not expect a monk with teeth... (Not to mention they will have no resistance to Smiting skill)
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