Power attack is a good option for this character.
Extend spell is also a good option. I often find that I am casting Divine Favor most combats, and extending it would be quite useful.
I found mobility to be very useful for my cleric, though I also took the feat that grants a +10 feet to base speed. Drawing the attack of oportunity so that your fellow party members do not, and getting to the ally that is downed with your healing spell, are both important aspects of a cleric.