4S - I just removed my TwelveSouth SurfacePad a few days ago to apply a Skinguardz skin in a pink water lily print. So currently, my phone is naked, except for a pretty skin showing
Picked up the official Apple leather case for my 5S. Pricey for sure but it is great. Love the way it looks on the phone. You can still see the metal band around the side and it keeps the screen elevated if you put it face down. Add's almost no bulk.