I found the "pro-fit" website that has some nice mounting options, including one that you can use regardless of case, and one that secures the item w/ the round belt clip thingee you see on a lot of phones. I'm thinking of getting the metal case and that would work well for it, but only if I used the case.
the universal holder "migrip" would work with or without a skin, it would seem
here's the link:
http://www.pro-fit-intl.com/Universal_Mounts/
I looked at the pro clip, but I have a jeep and don't like the mount right in front of my air vent (where they place it in a Cherokee). I worry about too much hot or cold air affecting the device's performance.
I'm thinking of placing it either between the guage cluster and the vents or on the left of the guage cluster, right next to the A-post.