I'd like to add another one I'm currently reading.
http://www.amazon.com/dp/0760339759"The Pacific War - The Strategy, Politics, and Players that Won the War" by William B. Hopkins
this book is AMAZING. It's a great overview of the war in the PTO. He doesn't write it chronologically, but instead uses "For the sake of clarity, chronological order has been set aside in many cases in this book in favor of a region-by-region approach to events." I gotta say, this man, a decorated WWII USMC 3div Veteran, walks a very fine line from "historian" to "anthropologist" in his objective, macro view. Not only that, but through his approach, one can almost feel like a fly on the wall viewing the events taking place. I'm only on Chapter 3, and I'm completely hooked. I can't wait to see how everything comes together in the final chapters of this book.
Also, something AMAZING for research, in case this hasn't been brought up yet,
Admiral Chester Nimitz's "Gray Book" is now available for downloading.
Description
The Command Summary of FADM Nimitz was compiled by the War Plans Section of the Pacific Command Headquarters in Hawaii during World War II. It contains daily estimates of the situation, command decisions, and running summaries of communications from December 7, 1941 to August 31, 1945. Naval War College Historian Douglas Smith avers that it is "the most authoritative source on the Pacific War available anywhere".
http://usnwc.edu/Academics/Library/Naval-Historical-Collection.aspx#items/show/849yeah... it's awesome!