Personally, I'm a big fan of DeSantis holsters. I've found with a good belt and a good holster, I can conceal OWB just as well as I can IWB, but it's a lot more comfortable and I don't have to plus size my pants (well, not for my gun anyway!).
Another one I like is the Aker Flatsider. Conceals even better. They use a design very similar to Galco, where the outside face of the holster is completely molded to the gun and the inside face, the part against the body, is completely flat, rather than both sides of the holster being molded to the gun. It allows the gun to sit even closer to the body, making concealment easier.
http://www.desantisholster.com/ If you find one you like, Google the model #. You'll save $10-20 on it.
http://www.akerleather.com/ These tend to be less expensive than Galco or DeSantis, but they are good holsters.