I really like my Aker paddle holster. I have it in my drawer for days when I really don't feel like wearing a gun in the office, but need ready access. The holster itself is nice leather, while the paddle is a very durable and thick polymer, much sturdier and stronger than something made out of Kydex like Fobus.
They even make some paddle holsters that look like they could clip onto a duty belt. They have wedges on the inside that hook onto your belt and really make them hard to just accidentally flop off.