The Dual Case mentioned earlier is a good one, I've had similar for previous phones. The Verizon Slim Case is what I finally settled on. Not what I would consider perfect but is slim enough and doesn't collect dust and lint in and out fo the pocket. Verizon Skin Case (Purple) for Motorola Droid X2, Droid x#
I also love the look/feel of the phone without a case but am not as positive as you are that I won't drop it. If you haven't looked at it already you might consider the Zagg Invisible Shield. I've had it for several other phones and it's pretty awesome although it won't offer any type of protection from dropping, just from scratches. It also makes the phone much more "grippy" in your hands and on surfaces like your car dash.