With the dock protecting the screen when closed, and, being careful with it, I have decided I don't really need a case. I entertained the idea for a while, but, decided I'd keep the money. I keep my Prime in a leather bound semi-padded binder that zips closed. When I want to use it, I take it out and I'm careful with it. I like how sleek and slim it is without a case. I'm really careful with it and it's never in a scenario where I'd be concerned about dropping it. My phone, however, is a much different story. My phone's case has saved me from needing a new phone on countless occasions.
If I had to get a case though, the Gumdrop looks really nice. It's a shame they don't make cases for Android phones, at least not that I saw.:'(