Didn't know about SmallRig... looks interesting. I've also discovered that B&H carries a bracket made by Gitzo for this camera. It looks really well made, although a bit on the expensive side. So it seems we have RRS, Kirk, SmallRig, and Gitzo as options.
@DP: Do you actually use the SmallRig bracket? I've seen some comments that it doesn't fit snug enough to the camera. Any comments on that?
Thanks all for the comments so far. For now I've eliminated RRS, so any further comments on Kirk, SmallRig, or Gitzo are welcome.