My iPhone will be here tomorrow and was wondering what everyone's opinions are about which is the best case out there for their iPhone 4? I ordered the black bumper from Apple but may think about exchanging it because I read that people have problems with scratches on the back of the phone. I'd be interested in a case that is uni-body, having had a 2 piece case for my 3G left marks on the back of the phone after a while where the case fit together. Thanks for the help

