I've already ordered the SGP Ultra Oleophobic Screen Protector for my iPhone 4. But I need a back protector. Right now I use a Griffen Reveal (which I love. it combines a bumper with the peace of mind of being able to toss the phone on its back without worrying about it getting scratched) but I saw the thread in which the OP said the Reveal scratched the back of the phone due to particles getting stuck behind it and then rubbing the phone. So I need a back protector. I used to be a ZAGG guy, but their protectors feel WAY too weird and gummy. So what's a good back protector (only)? Is there any that arent part of a "complete cover"?