There are few different ways to case up your Nokia Lumia 920 depending on where you are going and what your needs are. I have three different types in my possession and made a quick video reviewing all them for you. There is the Chromo Inc. Backup Battery Case 2200 mAH, the Low Profile Covert Branded PU Leather Wallet Case and finally the official Nokia 02733Q2 CC-1043 Cover.
If you have any question on any of these case leave them in the comments or even better send me a tweet directly.