Raven Concealment Phantom. I've got the OWB model hooked up now, but also have the soft loops for IWB carry. I prefer to carry between appendix and 3:00 normally.
Here is a great video showing that an open top holster has enough retention to get you through the typical day and a bit more. As a side note, your testosterone will go up 50 points just from watching it. Enjoy.