Problem with the cc-1020 (case that comes with the phone) is that they get dirty very easily.... the corners get black marks, and the overall colour fades. Can't seem to wash them either with any luck

I have the official Nokia hard case cover, it's quite good. You can actually take advantage of the curved glass as it doesn't cover up the sides, yet still offers protection for the sides/front if you were to drop it

I'm just wondering though whether the cc-1020 can cause your phone to creak over time? My cyan n9 now has a slight creak at the bottom....you can feel slight movement between the screen/body when you push it on the bottom