I picked up a Belkin case. Has hard plastic outer case and a soft rubber liner. Black hard plastic, red rubber liner makes for a nice look and gives me a little more protection and a better grip on the phone without adding much to the size! Lovin the 920 Lumia!
On the first week I owned the Lumia 920 I kept looking for a leather pouch to protect it against scratches. None fit. The closest was the Louis Vuitton and it fits so snugly. I gave up and I saw the hammer and knife scratch test. I'm convinced it does not need protection. I've banged it a few times and no marks so far. Enjoy the toughest phone.