To the original question:
I don't know enough for a full recommendation, but one year Dr. David S. Norris taught at our district's family camp, and I was thoroughly impressed with the scope and depth of his teaching.
He may be someone worth checking out.
Another fellow is Dr. Sydney Poe. I can't vouch for him, but my wife had him for a teacher at Bible College and expressed great things to me about his teaching ministry.
Here is a book by Dr. Norris:
http://www.amazon.com/Am-Oneness-Pen.../dp/1567227309
Here is a link to a page about Dr. Poe:
http://apostolicleadership.com/?page_id=41
Hope it helps!