I got a cheap but very sturdy "i-Blason" bumper from Amazon. Tons of color choices. A bumper is my chosen style: easy-off, decent drop protection on the corners, and both front and rear are elevated away from any gritty surfaces. But within the outer edge, the phone retains its original thinness. Simple and minimal. I was wishing for a "bumper case" before Apple even came out with them!
(I don't need scratch protection from keys etc.... my iPhone goes into pockets ALONE.)
I do think the i-Blason could be a little less thick. I could settle for less protection and more pocketability, especially on the rear rubber ring, which is oddly thicker than the front. (Making a deeper "well" in back.) Not a very visible difference, but you can feel it if you care to, and I know it could have been made slimmer.