There are a few top holsters out there for the P226 line. Be sure to ask if the rig will properly fit a P226R model or 1913 rail if that's the SIG P226 version you own.
I'd check www.Miltsparks.com www.safariland.com www.blackhawk.com www.mitchrosen.com www.blade-tech.com www.comholsters.com www.kirkpatrickleather.com www.highnoonholsters.com www.donhume.com
. Other popular holster makers include; Alessi, Galco, Ted Blocker, Greg Kramer, Mernickle, Bulman.
The Safariland SFS & ALS holsters are well engineered. The SERPA brand is fast and secure too. If you want a high quality leather rig, the Kramer horsehide is a good choice. Many "armed professionals" use Kramer, Milt Sparks & Mitch Rosen gear.