I agree to the others above from the effectiveness point of view. But maybe, for your decision, you should also consider what your deity would suppose you to do.
The cleric in my group is settling into buff everybody mode -
Bless, Prayer, circle of protection from evil, and for making attacks -
spritual weapon (a book) at 8th level they attack at +10/+5 for (1d8+2) cast 2 and a prayer -
+11/+6 (1d8+3) x2