I'm a big fan of the Galco Concealable:
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-or- what's known as "Mexican" carry: No holster, inside-the-pants, especially for the larger .45.
I also like the Fobus line of paddle holsters: Cheap and comfortable and easy to get on and off with a minimum of fuss.
I believe, however, that I'll have to find a very comfortable, very concealable shoulder holster, at least a weak-side draw if not a double. I ride a motorcycle, and if it should ever happen that I have to present while riding, all I have is my left hand...my right hand
may have to remain on the throttle. My Lovely Bride refers to me as "Scenario Boy" since I tend to envision every concievable scenario that might occur when making preparations, and this is one of the results of those ruminations. I'd be interested in suggestions from anyone with real-world shoulder-holster experience.