I got one of these for a case. It's really inexpensive, but is perfectly good quality and lips over the front. I tend to keep the dual screen case on, but it's a good alternative when rocking just the phone.

Edit: I will say, this case makes it a little hard to press the volume/power buttons. So if that's really annoying for you, pick a different case - I just always recommend one that has a lip to protect drops on the screen.