I just got the dark gray Body Glove case. It fits -- no pun intended -- like a glove. Which is great, I guess, but the problem is, it's nearly impossible to get it off again! It's a problem because I was hoping to be able to switch back and forth between having a flat back, and having the button+clip attached. That's not practical if I need a screwdriver to pry off the case every time.
I think I might get one of those simple "universal" vertical pouch cases with a clip. In wintertime, I just keep my phone in a silicone case in jacket pocket, and I don't need a clip or anything... but come summer, I'll want to hang it in my shorts pocket or outside my jeans.