I need detailed refreshers

[Zingydex]

Ok, I've descided to cut the differnce between an avenger and an angel.

Merc will be a combat act 2 merc with an insight weapon.

Now, will the prayer and meditation aura's synergise?

I am also looking for recomendations for what to make the insight runeword in?
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Yes, it will. You'll effectively get a doubled prayer effect along with the mana regen. Any four-socket polearm-class weapon will do for Insight (yes, the desert mercs can use polearms), although ideally you'll want an ethereal version for the extra damage.