I ordered a cheap rubberized hard case for my DX off ebay and it has worked great so far only a couple drops, but the case has help up well for a 2.99 ebay special.
Probably the most protection with the least added bulk for a case. Has a rubberized coating on the outside that still remains slick for easy pocket removal.
And..I also am waiting for the Otterbox version for the DX :icon_evil: