I have taken
Lethal Force Institute's LFI-1 class with Massad Ayoob, and I think it is excellent. It is specifically oriented towards deadly force training, as opposed to just weapon craft, and it gets into very detailed discussion of the laws and ethics of lethal self-defense. It is not a CCW course specifically, but would be very useful for that. The 2008 schedule should be out on that website very soon.
If you choose to take another course, you should at least get and read (if you have not already) Ayoob's
In the Gravest Extreme.
Good luck!