IMHO no str in the world will make a cleric kill 'fast'. if your in a party, healing others, str is *completly* useless. if your soloing, ye it helps a bit.
the most important stat for a cleric is end. a cleric needs to stay alive. 'nuff said.
after end, i would put spr. never tested it, but i think adding X spr would probably give you about the same dmg bonus -through crits - if not more then adding X str. im not sure of course, but spr definietly adds to your dmg. the SP bonus is not of importance but the m.def is. again, it helps you to stay alive, to keep others alive
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