I'm coming at this from the tank's point of view and I would like to know just how much more efficient Cure I and Regen are compared to Cure II and Stoneskin. Does anyone have the level 50 MP costs of each spell available?

The reason I'm curious about this is that I would like to know to what extent a tank smoothing out their overall damage intake can help a healer. If I could somehow make it so that I take the same damage overall but eliminate the need for Cure II in order to prevent a death, how much mana could I save you?