If Blackhawk makes a Serpa to fit your firearms, get one.
If they don't get something with a secure paddle or belt loops, and a thumb snap retention strap, like a Galco or Bianchi or an Uncle Mikes.
Retention is VERY important. And a solid attachment to your belt is equally important.
You want the gun AND the holster to say put. You don't want a holster that shifts around when you walk--sloppy holsters make it too tempting to fiddle with your gun when OCing, and that is a BIG no-no.
Good luck, and welcome to OCDO!