I prefer to call mine charcoal. Sounds so much more sophisticated than black.
I have the holster, a Casemate Barely There, and Otterbox Commuter case. The holster is for when I don't have a lot of pockets (I hate putting anything in my pockets) but I prefer to use the Casemate for daily use. The Otterbox was my first case, but I found it a bit too bulky on my svelte Torch. I'll keep it for when I think I'll be in a work environment where there's a greater risk of the device getting smacked.
OP: Great question, but did you consider doing a poll? Maybe it's already been done......