I would not worry too much about Mana or Wis gear. Sure you need some like the cheap Moonstone Ring. And the strength helps also.
You can have a Mana pool of 3,000 and you will still run OOM at some point. Then you have to sit and med for 15 minutes. By then the group breaks up and is long gone.
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Your group is not constantly going to keep pulling no matter how much mana you have. You run out of mobs for one thing.
Clerics can really get by with very little gear unless you want to be a Battle Cleric. Then you want more good AC gear and great weapons than wis, mana items. You are going to pretend you are a Pally not a Cleric on average.
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