Keeper's set
Allow me to recommend dropping the zealot ideer.
If you want to heal, then go magi (armor/weapons are both easy and cheap to get), tinkets can be a mix of magi and cleric.
Why? simple, if you are there to heal (staff), then you dont do any dmg. No matter what gear you have, so better to go full heal and keep all alive. + you want to have avatar up all the time, so you can use “Rejuvenating Tides” 2 times every 20 sec or so. This will give all the other 9 players so many stacks of “Grace of the land” that your groups dps will be alot better then anything else.
If however you dont plan to be the main healer, then go berserker or viper (power or condi) and do dmg as your main role and still heal (spread grace of the land) as often you can. (this is without staff btw).
Zealot is a wierd middle ground, niether good heal and still bad dmg. simply a waste of gold
In that case, though, would Minstrel be a reasonable option, or just too defensive-stats oriented?