Well, hi. I have seen builds around, and need opinion about my choice.
I’m a pve player, mostly auto during dungeon/missions.
Pretty much I love heavy support playstyle, and priest3 is simply 
I don’t really like totem-like skill though.
So, this is my base build with stats 3 SPR:1 CON
Here is the breakdown :
Cleric - Heal 5 and Safety Zone 5 for generic purpose, Cure 1 because I don’t invest heavily on INT
Priest - Aspersio 1 for defense purpose, Blessing 15 for damage (esp. after kTOS patch hit), Resurrection 5 for quicker and safer side (15% HP more), Sacrament 1 for the bonus line damage, Mass Heal 10 for maximum healing output, Stone Skin 5 for maximum block amount (and the remaining into Revive, hence it’s at 8)
Take in note that I’d absolutely take 2 circle of Cleric, so that I can get 10 Heal, +20 more Block @Safety Zone, escape skill (Fade 1) and filler skill (Divine Might 5)
The real doubt is, what circle should I pick next. I have played Chaplain, however it doesn’t benefit me pretty much (at least ~17x, even I don’t need Aspergillum in most cases). I heard starting from 200-ish Chaplain falls off (because auto attack is meh from that point), so I’m considering going either Oracle, Krivis, or Plague Doc.
Please correct me though if Chaplain still do good.
Here is my reasoning :
Oracle - because of its Counter Spell and Prophecy. My build lacks of another magic blocker (only Safety Zone does that), is this skill good enough? And Prophecy for debuff blocker (It has counts on it, but does mobs 200+ spam their debuff? I mean, most annoying debuff in PvE environment is lv 1, right?) And do I need curing skill other than Cure?
Well, Forecast is a bonus for my party member and the other skills seems good for farming purpose.
Krivis - pretty much Zalciai and Daino. It’s arguable to pick 1 circle only for those skill, as most pick Zalciai for easy Incineration (I don’t invest in INT, remember) and Daino (they say that it’s scrollable, yes, but I’m on my frugal side 
though I barely face buff-limit problem /okay I’m at 17x when I wrote this, so please correct me)
Plague Doc - Healing Factor, Bloodletting, Fumigate. Those three skills shine the most for me, however :
Do I need Healing Factor for, well, me? My tank? With lv 10 Heal and Mass Heal seems overkill to me.
Bloodletting is good I’d say. No need to worry about debuff count.
Fumigate, is this skill worth it? Never have faced late PvE.
tldr; I’m torn between Oracle, Krivis, and Plague Doc (or even Chaplain) for the next 2 rank. I’m PvE player.