Looking for an easy to remove case.

I spend a ton of time in my car, usually 5+ hours a day so I use the great pro clip powered mounts. Problem is that you can't use cases with those mounts so I'm just trying to find a nice slim case that you can fairly easily remove and take off once a day without damaging the phone or case.

Try a cheap rubber one from ebay, they are generally a easy slim on/off case.

Either the official bumper, the Poetic bumper, the Nikkin hard slim case or a TPU case.
I have all but the OEM bumper, but the other 3 are so easy to take on and off, not a pain whatsoever.