Kane and McHenry Enterprises' Cellhelmet for iPhone 5 ($50) is an example of a case more notable for the services that surround it than the product itself. Coming in eight semitransparent colors, the TPU case is similar to Incipio's NGP. It offers Sleep/Button protection, but no coverage for the volume buttons, and separate openings for the headphone port and microphone, Lightning port, and speaker. The main selling point is the one-year warranty…
