I personally would never buy a case. Because then what would be the point in having gorilla glass, kevlar back and metal frame? Plus they just add bulk and make the phone feel less nice. I rather have the metal be scratched and the paint fall off so it looks much more baddass.
What I DO want is a good holster. Haven't looked for one, but maybe some of the ones meant for the S3 could fit our RAZR HD.