Don't know if you're still in the market, but...
http://www.range5.com
Go there, look at the SOC rig - watch the video. I played with one this past weekend, and it absolutely ROCKS. Quickest draw of anything I've tried, and VERY secure. The one I tried for a Beretta M9/92FS didn't even have a strap across the hammer or slide, and it WOULD NOT BUDGE unless you hit the release switch with your thumb.
High-speed gear costs high-speed money, though, so don't look at the SOC rig unless you're ready to drop about $150.
The standard G-Code paddle holsters are good shit also, and much cheaper. I'd highly recommend a lowering adapter if you get one, though - unless you're used to the butt of the pistol being in your ribs for belt carry.
I currently use a standard G-Code holster for my Hi-power when doing reloading or drawing drills, and it's damn nice. Smooth.