I would go MND then Vit then Crit then PIE

Reason is simple

MND well need explanation?
Vit is simple if you plan to do turn 5 you need to aim for about 4.1k HP even as healer
Crit Simply because Higher cure helps and for SCH it doubles the Shield
PIE Better AetherFlow for SCH and more MP for WHM again in turn 5 there is a lot of raises involved and we all know how much MP cost raises