Top brands....
If budgets or $ isn't a major problem and time(waiting) is okay, here are a few good brands for a concealment P226/mk25 holster;
Greg Kramer(horsehide), Milt Sparks, Bulman Gunleather, Mernickle, Mitch Rosen, Blade-tech, COM Holsters, Don Hume, Galco, Ted Blocker, Kirkpatrick Leather.
Many gunners & armed professionals like horsehide over traditional cow leathers. Blade-tech, COM Holsters make popular Kydex rigs. The Safariland ALS-SFS & SERPA holsters are used often too.