I use a Graft case and really like it. It provides protection but is not too bulky like the Otter cases.
Makers of Unique iPhone Cases | Graft Concepts
I carry it on my belt in a RipOffs case and no one even knows what it is really.
Welcome to the Ripoffs division of US Armor
After the iPhone 3 the Otter have really gone downhill to me and they no longer protect the phone at all from dust and stuff getting inside the case,I am just tired of that.
The Lifeproof are interesting but I didn't like the screen cover and the case just feels cheap to me overall.