All of your builds are viable.
But, here’s my opinion about them:
Priest:
The build is pretty good, but I woudn’t take Krivis 2 for Divine Stigma, since is quite hard to land and isn’t 100% uptime. Also I don’t think lvl 10 Daino is needed, since Chaplain “compacts” all the priest buffs onto 2 slots.
And I would take 5 points of Sacrament and max out Revive, also take 1 point of Ressurect and put on Monstrance, leaving Sacrament 5, Ressurect 4, Monstrance 1, Revive 10.
I would make Cleric > Priest > Priest > Krivis (where your wizard gets Linker 2) > Priest > Chaplain > Oracle / Plague Doctor.
2H Sword
A great build in my view, but I prefer Bash over Thrust.
Supp
Since will be more a support oriented, as I can see, I would take Cryomancer instead of Pyromancer (Freeze is damn OP in PvP, but Pyro is better for PvE). Good build overall.
Rune caster
Can’t say much, don’t know Rune Caster either…
For your 4th member, I think is better to take Archer. Since you have a Linker, the Archer can focus on a single target build and melt many enemies linked, or take a AoE Archer for PvE, or even an utility Archer.
When your 4th member decide his build, post here too 