Does anybody have any suggestions as for what to do about protecting the back of an iPhone 4 when using a bumper case? I'm thinking of getting the Deff Cleave aluminium bumper case and the SGP Glas.t but the Glas.t only covers the front... And I'm worries I'll drop the phone and be unlucky and have the back plate smash (or it will just scratch up from general use...) Any suggestions on what I could do about the back cover? Is there anything like the Glas.t for the back? Or will a screen protector help? Thanks.