just fyi but on my Enhancement Shammy main it works out cheaper to cast a Cleansing totem than the equivalent cure due to the totem recall ability

90 mana for the cure
110 mana for the totem (I have a small mana pool)

+ 25% mana returned using totem recall = 110 - 27.5 = 82.5 mana for an AOE repeating decurse