I've got the Platinum 4G case from Best Buy. It works great so far, and it does not scratch the phone. It fits onto the phone very securely too, and it protects the phone while holstered. The case itself is two pieces, one that slides on the top, one that slides onto the bottom, and the top part secures onto the bottom part. The full body case itself is designed to fit into a carrying clip which protects the screen for the phone. It does a great job so far
I know my description is probably lacking, but I would give it a 9/10 so far.