Assuming the ability scores are the same as BG1, you'll start getting magic defense bonuses & lore bonuses at wisdom 15. If I've got points to spare in any class I dump 'em in wisdom (if I can get it up to at least 15) just for the magic defence. Cleric starts getting bonus spells at wis. 13. Intel governs a mage's spell levels (how high a level of spell they can memorize), % to learn spell, maximum spells per level & lore bonus (15 & up). I think the cleric only benefits from the intel lore bonus.
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