I might do what Pam does, Doug, if you plan on keeping it in a pocket at all times. The clear plastic skin on the face will protect against scratches and if it's in your pocket otherwise, you won't have to worry about dropping it and it'll keep it slim/small. All other cases will add bulk. The problem, of course, is that you'll have no protection against drops.
I wear mine on my belt in a holster - I pull it out of the holster and use it without any case when I'm using it - don't even bother with the plastic skin and I haven't had any problems so far. Admittedly, I live life on the dangerous side ... :D