There is a Meguiars rep who lives in Boyds, MD ( has had some seminars at his beautiful home ) I think he has posted on this forum. If you do a search you may be able to find him and get a recommendation.
I mention him because at one of his seminars that I went to at his home, some of the detailer that attended were excellent. I mean really GOOD.
I do all my detailing myself with Zaino, but if I were to hand my car over to someone else I would attempt to contact him for a name.