Hmmm...Enhance ability might be a good choice. I'll consider that.Divination? Really?
I mean, it's only good for one casting a day anyway. And requires a material component that's consumed. Just doesn't seem like a smart choice.
If you can't find a 4th level spell you like, I don't think you HAVE to choose a 4th level spell. Why not have a good situational spell in your pocket instead? Clairvoyance or Enhance Ability or Freedom of Movement or Locate Object or Locate Creature or Tongues or Zone of Truth?