When I had to CC, I carried mine in a Kholster. When I wanted to carry on the belt and OC or "casual conceal," I carried it in an Uncle Mike's Law Enforcement paddle holster, made specifically for the XD9sc.
I found both holsters to be superb for their intended purposes, and recommend each highly. I'm not generally a fan of paddle holsters, and have always preferred leather to kydex, but the Uncle Mike's holster won me over, and for a heck of a price.