First off, If I were more creative, my UCC name would have been MMAgunguy. Nontheless, the perfect holster is a respective term, dependent on the user's needs and body style.
I like Raven Concealment Systems Phantom holster for OWB. It holds the pistol in close, almost the exact position as my IWB, which currently is the CompTac (MTAC) Minataur. A Google search will get you more info. I have heard good things about Blade Tech holsters as well. There will likely be suggestions for Serpa holsters; I loathe manual retention devices...- a subject for another day.
Hopefully I can get my wife to go to the next class you are helping the girls with. Maybe you will spark her interest in H2H; she quickly grew tired of me drilling arm bars and guard submissions with her.