Timothy, just haven't gotten around to buying the holsters yet. I figure anything close to the body, not excessively canted, and of course concealable would be okay. I've read through the IDPA rules, but it gets confusing between the different leagues. No rush. Have my eye on a Bianchi holster.
Les, I've shot (am shooting occasionally) USPSA. It it primarily a game. A run and gun game. A good game and yes it is fun. IDPA, for all the ribbing it takes about "vests" is, I think, does have a more practical slant in terms of defensive pistol.
Also, truth be known, there are more IDPA matches closer to me than USPSA.