I've had two Seidio Innocases for my DINC and both have done well. My first one fell and cracked a corner of the case off which wasn't a big deal. My second had the infamous shedding problem with the case flaking off. (no reponse from Seidio about it)
Having said that, I DEFINITELY suggest the Griffin Reveal case. It's clear plastic back is equally hard/protective as the Innocase and best of all its a one piece case. The rubber boarder has a good protective grip to it as well. Only problem is some dirt/dust gets caught behind the case, easy fix.