Priest 1 gives Ressurection and Monstrance which is nice in a DEX inqui build since most of your damage comes from the Wheel + Conviction + God Smash burst, which can be done easily in under 20 seconds (Monstrance’s duration).
For rank 3, I would suggest Priest 1 or Diev 1. Cleric 3 isn’t a terrible choice but it’s better suited for INT builds (Cure + Heal can provide a lot of dps with high INT).
Diev 1 gives Laima, which makes monsters move slowly but most importantly reduces your skills cooldowns by 20%. Vakarine is also quite nice to save on teleportation fees.
Rank 7 it’s either Kabbalist 1 or PD 1, really. Those two classes provide a good utility with just 1 class circle. Kab allows you to fully restore one person’s SP and revenge sevenfold the pears. PD allows you to be immune to debuffs nearly 100% of the time with Bloodletting and Healing Factor provides a good one-person quick regen.
In my opinion, I prefer PD 1 over Kab 1 in that build. I have both a diev 1 pally 3 and a priest 1 pally 3 and I think both Diev 1 and Priest 1 are equally good.