Can't go wrong with a Blackhawk SERPA. 3 position adjustable cant, forward, straight, or rear.
Also just picked up Fobus Roto-Tactical holster for my G23 to use as my duty holster. Love it. Their "Roto" models rotate 360 degrees with something like 32 locking positions. Their tactical model is their holster that accommodates rail accessories which I needed because I work graveyard and keep a light on my weapon. Works with any rail or trigger guard mounted accessory though.