I DO agree Priest 1 is mostly a lost rank (except for Ress), and the OP didn’t even say in what server he plays. In Silute Monstrance scrolls are pretty common FYI.
In a support build with Paladin 3 (I don’t really recommend it due to damage synergy with Inquisitor), I kind of imagine 2 kinds of builds:
Cleric 2 (basic healing for parties) -> Dievdirbys 1 (cooldown statue that attracts aggro + SP cost reducing statue) -> Paladin 3 -> Plague Doctor (good damage synergy with Diev statue, immunity to status and Healing Factor) -> Kabbalist (SP battery, some utility in PvP if you like it)
Cleric 2 -> Krivis 1 (Daino’s buff count increase + Zalciai debuff in crit resistance + Zaibas damage for leveling) -> Paladin 3 -> Plague Doctor 1 -> Taoist (synergy with Zaibas and Elementalist due to electric skills damage buff, AoE cloaking, increased elements resistance)
You can change Diev 1 for Cleric 3, or Priest 1 if you feel the urge to do so. Do take note that since Rank 8 Paladin 3 seems to have a off-support/melee damage role and leveling up a Paladin 3 until R7 is really awful, so if you really like Paladin keep that in mind…
Stat-wise, you might like a huge crapload in CON (about 100 invested points at least because of colossal post-Maven maps monster damage) and about 2:1 INT/SPR invested points, as you’ll be expending a good amount of SP giving support.
Didn’t recommend Miko here because I don’t have really enough information to judge it as a good support.
@aarigonlanzani, if you change your mind and do a melee Paladin 3, take Cleric 2 -> (Diev1/Cleric3) -> Paladin 3 -> Plague Doctor (IMO the best choice, however Kabbalist has huge SP-filling support if that’s your thing) -> Inquisitor. I’d recommend NOT to follow alexandrious2001 as he has lost his mind absolutely. Do take Priest 1 if you feel such an urge, but I personally don’t advise it.

Think on it.