+1 for the Comp-Tac paddle holster, I failed to mention them in my previous post. I have one for my G19 and my G26/27. The CT products are amazing, the paddle is solid, secure, and holds the weapon nice and close.
One nice thing about CT is their return policy, if you get the holster and don't like it, as I recall, you get thirty days to send it back. (Please verify return policy, I didn't check) The CT paddle conceals well, I highly recommend it.
Good luck in your search for THE owb holster!