There are lots of good holsters available and far be it for anyone to say there is a "best" one. Lots of personal preference involved. I have three Dual Carry Holsters from David Bullard in Texas and really like 'em. It's a good value at $100 for the basic holster and can also be had with some exotic skins and design if that's what you like. This one can be converted between IWB and OWB wear, has adjustable height and cant, and can accommodate hardware to allow you to tuck in a shirt. Here is a Dual Carry with my new CCO.
http://www.dmbullardleather.com/1429711.html