The build on a PvP oriented chanter would be to stack crit stones on a staff. The idea is that if a 2-h weapon were to crit, it knocks whatever you're hitting down. That's really the only reason you'd slot crit, so if you've got money to burn pre-30, slot hp.
They're worthless as an off-heal class, they just have a decent cast-and-forget heal over time. Decent dps to 35ish, in PvE. Good enough for people to want you to run Fire Temple or whatever.
There was a theorycraft thread on leather vs chain on AionSource. I don't feel like finding it again, but if I recall correctly, the numbers worked out for a slight advantage to gearing with leather if you don't slot parry.
Edit:
http://www.aionsource.com/forum/chanter/57095-eikois-sensational-thread-give-chain-clerics.htmlDon't use mace+shield, unless your cleric dies or something.
Edit:
Also, remember to weave your attacks. Maximizes your dps while nearly halving mana consumption.
Best place to read up on general chanter info:
http://skychanter.com/This post was edited by PsycTint on Oct 12 2009 10:10pm