Safariland makes a good series of thigh rig holsters. I love their 6004 series. I use it all the time. Best part about it is that you can take the holster off and use it for a duty belt rig with just changing the mounting plate. I have four different duty holsters and one thigh rig mount. I just change the holsters for the different guns. Blackhawk also makes a good rig.
Safariland 6004 Series
Blackhawk CQC Series
