Let's see. . . the most often turned to holster I use for one of my CS9s is an Alter Ego from High Noon Holsters. It's not the prettiest, but it does what I need and it does it quite well.
Alter Ego
Anyway, here are my guns and the leather that carries them:
These two CS9s (one DAO and one DA/SA) are sweet!
The High Noon Alter Ego (an IWB) is used most often with these two guns -- though I think I'll be using the Fusion Paddle a bit more in the next month, too!
Wild Bill's Concealment Fusion Paddle slips over my Beltman belt easily and holds the gun remarkably well to the body for an OWB paddle holster
I recently picked up this Lobo Gunleather Model 1-SL with a thumb break for my 3913 . . . but it does a sweet job too for a CS9! I've use it when carrying a CS9 open carry, and I appreciate the additional safety the thumb break provides.
Finally, I use a Don Hume H760 ankle holster (typically wearing somewhat baggy pants) when I need to have a deep concealment.
Finally, in the "family picture" you will see a single mag carrier from Wild Bill's Concealment and a dual mag carrier in black from Akers.