I still run out of mana on my shamans in some fights where higher +spellpower would help as I would have to heal less, and cast less before the boss dies, therefore removing my mana issue. This is with 16.5k mana and something like 279mp5 with water shield up (not including mana spring totem).

Also with the talents being condensed I can now take all 3 points in the 12% of intellect as mp5 talent.