I'm rather partial to Suggestion. Used properly, it can be potent in and out of combat.
Fly and Haste are also nice.
Because clerics get their entire spell list, and wizards and sorcerers have to worry about spell research or a handful of known spells, I tend to encourage clerics to always keep a Dispel or two on hand, so I don't have to worry about it. One Dispel Magic is in my cleric's default spell load and I have scroll for emergencies.