The holster I almost always default to is the Milt Sparks VersaMax 2. The VM2 is just so flexible. Sometimes, like now, I have the kydex clips attached, and I can just slip it on the pants I'm wearing, and (yes, it's true), can actually tuck my shirt over it, and have a very presentable appearance.
Have I mentioned my Pocket Defender holster for my Ultra CDP? K&D Holsters made it for our very own Duane, here at the board, and I bought it from him. Believe it or not, when my R9 was at the factory, I actually wore it with shorts for a couple weeks! :-)
Also, I've got VM2 belt loops for 1 1/2 and 1 1/4 belts, and that setup is even more solid. Just a little less "low profile".
Enjoy the search! BTW, have you ever used Lightening Arm Sports? They generally have some top notch holsters in stock, albeit at a slight premium, as they buy inventory from holster makers who are really backed up with orders. A few extra bucks is okay by me, to avoid a months-long wait.
--Spectro