I agree otterbox makes some of the best cases. I use this Otterbox Commuter. It's rubber with a plastic "clip" to keep the rubber on tight. Very durable and not terribly bulky like some of their other cases. I also have a screen protector (forgot the brand). After performing the drop test several times with this case, I have found it to be pretty reliable.

http://www.amazon.com/OtterBox-iPhon...7433608&sr=1-5