I really hate the idea of putting a case on my iPhone 4, but I've got a hairline scratch on the back and the reception issues, so I'm considering it. I want one that covers the back, so the bumper is out. I'd really like one that meets two requirements: 1. Doesn't add much bulk. I'd like it to be very slim. 2. Isn't "sticky". I've had a silicone case before, but it attracts lint and gets stuck in my pocket. Anyone have any recommendations?