I use an invisible shield full body shield. It costs like $25.00, and then another $10.00 for them to put it on for you (their website will list the closest location- Best Buy sells and applies them too).
It has a lifetime guarantee (covers the shileld itself, the installation if it ever comes off or bubbles, and against the device ever getting scratched under it) if they put it on for you.
So now I don't even use a case anymore. Just drop the Touch Pro 2 into my pocket, and it's guaranteed not to scratch.
Plus, like I said on another forum, it's like going from an old school laptop to a new one with a glossy screen. It just looks a lot nicer.