Best duo - non twink

[demonith]

I understand the sentiment of 60 functionality. I more interested in the path to 60.

more like duos that have interesting mechanics or surprise duoing utility.

cleric / chanter is a super strong duo. But are they the barney bad ass at level 30?

How about say a necro / ,age duo. fear kite with nukes and extra mage dps.

if min / max is cleric / chanter at end game, what is the min / max at low and mid game?