Regen and Divine Seal are both fantastic and should be used frequently. Be careful about Divine Seal->Medica II though. It can easily rip hate off an unprepared tank because all those boosted ticks give you aggro.

I actually tend to forego Aero II unless its a big boss fight because in order for it to outdamage Stone II every single tick must go off, which isn't really feasible when you're running with hotshot DPS and contributing your own as well. However, if you're fighting something that you know will be alive and vulnerable for the ful duration, go for it.