Yep, using a Casetagram case now and LOVE IT. It's so much thinner than I expected it to be (I was thinking along the lines of an Uncommon case). I got the transparent one so the sides are still visible, which I also quite like. Obviously, it's not going to save me from drops, but it will keep scratches at bay, so I'm happy with it.
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That's what I was planning on going with at first as well, having used an Element Vapor Pro and various skins from DecalGirl, SkinIt, etc., on my 4S, but beware if you're a person who likes to switch up skins with any frequency at all. They cling like a mother to the non-glass portion of the back and get stretched out like crazy even if you're meticulous when removing them, or at least all of mine did.
Yeah I don't really plan on changing them up too much, unless they get trashed and need replacement. I was talking with Lazerwood (real wood back skins) and they said they were going to be changing the adhesive that they use on their iP5 skins because the 3M they were currently using was so sticky people couldn't get the wood off and most of the time when they did, it was snap or crack the wood.