Just an FYI...
I purchased a black, plastic Grip Case from J.B. Camera Designs, for my new X100, and I'm quite happy with the product (fleaBay link below.)
At first, I was hesitant to throw a plastic case on a $1000 camera...but this case is small enough to be almost invisible in use, is molded to hug the camera close, exposes all controls and buttons and battery door, provides a better grip, and protects the camera finish from my grubby mitts!
Plus, the case is an American-made product at a reasonable price.