Tactical Defense Institute in Ohio
I heartily endorse TDI. I've taken many of their courses over the last 4 years, several of them more than once. The instructors are all first rate, and the student/teacher ratio insures plenty of personal attention by multiple instructors. They are serious, but can manage to laugh at themselves.
The classes are well organized, there is no wasted time. Since I am running out of classes to take at TDI I am glad to find this forum and this list of professional tactical training schools. It is time to diversify my training.
I will attend a private tactical carbine class with Pat Goodale (in WV) on 4/21-22 and then back to TDI for their extreme close quarters class on 5/26-27. I have heard good things about Pat's training also. I will let you know how it goes.