You should go full con only if you want to pvp.
Otherwise Your choice is between INT and SPR.
I recently tried That’s build full spr and some str.
Str gives you accuracy now 25-50 points on str are well spent to have a decent hit%.
Anyway spr will boost your blessing and asper(gillum?), while int will boost PD spell + some chaplain spell, like magnus exorcism.
Reading various discussions both builds have similar DPS outputs, but from my personal experience spr gives you much more team utility+tons of mana & sp regen.
Since you will spending a lot of silver in items for the buffs saving on Sp potions is not so bad.
Anyway you have tons of days to try these builds.
Keep in mind that i tried this build for a day, I’m not an expert.
Honestly I expected much better from it, before you can hit something you need 6-7 seconds to buff you up and they don’t last very long so you have to keep doing it, you would need an add-on to track them.
Anyway it seems that you pass more time buffing yourself than fighting and the return is nothing exceptional.
Now I’m trying c2b1s3pd2 full into it’s way more fun and immidiate than the chaplain for my play style.