If you want the cream of the crop, hands down, the best USPSA holster on the market is the Vice by www.gxproductsusa.com
Double layer holster, impeccable finish, more models available than any other holster company I've ever seen, the owner is a nationally competitive USPSA shooter himself, and most unique of all, their quick release lever. You can lock the pistol down between stages so there's no chance it can fall out. Or use it for 3Gun/Run&Gun where you need active retention for long movements, but then want to unlock it on the way for a lightning fast draw when you need it. I have no affiliation at all with the company, just a big fan of their work.