Once you hit 60 and you can readily convert hp to mana and vice versa, you have to just look at hp and mana as one big pool of resources. 1hp>1mana, but i don't think 1hp>3 or 4mana(1sta seems to return 3hp while 1wis returns 11 or 12 mana before 200.).Thus if you don't think you will hit 200wis easily I'd dump points into wisdom, like on a troll.
Mana cap certainly helps going into some fights, as a bigger pool can help you outlast mobs that slowly drain your Mana (does more damage than you can heal+canni+all the other stuff shm do)
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