As a new iphone user, I am doing my best to take precautions to keep the phone in pristine condition. Aside from drop protection and protection against the elements, the case itself should not damage the phone. I have crossed the following cases off my list as a result: 1. defender: the inner layer is plastic; not ideal as the inner case for an alu phone. 2. commuter: the rubber inner case let a rubber circular residue on the case. 3. powersupport: a great case which may mar the finish Any suggestions here on a 'safe' case which will protect the phone from the elements/drops, which won't cause damage simply as a result of installation. My candidates: 1. acase rubber inner/TPU? outer. 2. belkin candy grip: TPU. Anything else?