I’m a fan of well-designed cases for iPhones, and this one seems to have been well-thought out. The most distinguishing aspect of this case is that it comes with a sort of lock which latches the case shut, protecting it even further. The case comes with a back panel which snaps into place, which you can choose to set aside or use to completely protect your iPhone.
The Leverage case by Graft works with the iPhones 4 and 4S. Its hard polycarbonate shell has a soft-touch matter finish, and is available in black or white. The zinc-alloy latch is available in either matte or chrome finish, and works sort of like the deployment buckle on a watch band. The design isn’t supposed to interfere with the functions of your phone, so hopefully it won’t affect the antenna or signal.
The case is available from Graft for $59.95 (USD), but the white version has already sold out for now.