The Stixrud group in Silver Spring, Maryland, is the best place I know of for testing, counseling, diagnostics and the like.
All of the people there, and all of the specialists and groups affiliated with them are amongst the best in the country for a reason. I'm not trying to be an advert, but I had gone to countless doctors, psychologists/psychoanalysts/etc and "specialists" over the past 20 years of my life, and every single one before the Stixrud group misdiagnosed and quite often mistreated me and my family. It was hellish. The people off at this particular group were the only ones to truly care and understand to the point where they were not only willing, but almost adamant to keep up with me and asked me to stay in contact after the initial testing. I had been strictly against seeing any more psychotherapists for the past few years after what I had experienced with previous "caretakers", but I have to say that this place changed my mind and inspired me to find out more about myself, and see what I can do to help my processes in life. Dr. Black @ CAAT-online is also an amazing find, and affiliated with Stixruud.