The Rick Atkinson equivalent will probably be Ian Toll. I say "will", because his "Pacific Crucible" is the first book of a three book trilogy on the Pacific War - the other two have not been released yet
I think I agree. I read Pacific Crucible, and found it both readable and informative. Hornfischer, while good, seems to be more of a "snapshot" writer.
You might be interested in this; The Reports of General MacArthur http://www.history.army.mil/books/wwii/MacArthur%20Reports/MacArthur%20V1%20Sup/Index.htm#cont