I agree Blackhawk sucks for a retention holster. Spend the money for a Safariland Level 3 (or 4) duty holster. I use a Safariland 6360 for my P226R/X300V combo and it's a great holster. It's ALS. I paid $111.
I used to conceal carry a West German P226 in a Bianchi #5 ($30) under a T-shirt and that was fine.
I only open carry in uniform because it's a faster draw, my light-equipped handgun is huge, and everyone expects me to be armed anyway. Out of uniform, I conceal carry a Kahr PM9 everywhere. When I was younger, I used to expect to get in a gunfight at any given moment, but now I give up a little draw speed and the larger (superior) pistol for comfort and versatility of clothing options. I practice with the little pistol as much as the big one, so I'm confident in winning a fight with it, once it clears my pocket, of course.
Wearing a pistol visibly, I always assume some asshole may try to get it, so have a retention holster of your choice and plan to fight for it. Train for this also, on a padded mat (so you can "get real" with a sparring partner) at least one fourth as often as you practice shooting.