Another Vote for P7M8
I agree with the earlier posters that the HK P7M8 would be a superb choice for a highly accurate, reliable 9mm ccw. Although there enhancements that can be added, there are many good liability arguments for carrying a stock, unmodified weapon raised in this thread. In fact, a stock P7M8 is my carry weapon.
Any number of the other weapons mentioned could enhanced by adding a Crimson Trace laser grip which would facilitate accuracy. Alas, the P7M8 is not one of them.
Another possibility not mentioned by anyone else would be a Kahr T9; I am less enamored of the smaller versions of the Kahrs such as the MK9 and PM9 series based upon the way they fit in my hand. However, that being said, I tried a drill where the scenario was that I was in a mall where a madman with a rifle was about to start running amok. I had one shot to end the engagement and with only pistol at hand. Mind you I am not a regular user of the PM9 but was able to get off a snapshot at 25 meters that hit a human sized target square in the throat (I was aiming for the head on a static target). I am not certain that I would want to take that shot in a crowded mall, but the point is that even with an unfamiliar, highly compact semi auto with a very limited sight radius, there is more than sufficient accuracy at something beyond conversation range.
Your mileage may vary.
Regards,
Swelfelo