I had a bodyglove riser case on mine - but it killed the slim feel, which really helps at the edges if you're running one-handed. However, looking on amazon online at all the cases, I found
this two piece case, called a Hyperion Titan, which looked very slim, but very protective - with tapered sides preserving the feel of the phone. I figured the screenshots on amazon of this <$10 case were just the computer models, but having received it, I am really impressed. The phone feels very much like it does caseless. What's also cool is the lip on the case does not slide on vinyl car upholstery, so I can put it on the console and it just stays put like glue. I am guessing that's by design.
With all the money I have in this phone, I just couldn't possibly go caseless but I think this is a good balance of caseless feel vs protection. I am unaffiliated, just a happy end user.