All these cases will most likely to scratch the sensitive chamfered finish, noticeable on black iphone 5, if you keep taking the phone in/out of its casing.
I've settled for an Otter Defender and protective film, got them before I received my iPhone 5.
The new Otter Defenders are really tough to open without a phone inside, just imagine if there's one in it and you aren't careful taking it out again, more scratches!
My advise is to really settle for a case that you really like and do not take out the phone out as much as we did on previous iphones.