All three of Jeff Shaara's books are good.  There is also a book that covers a Confederate soldier's story called "Jim Mundy" by Robert Fowler.   Another really good book is "Unto this Hour" by Tom Wicker.  It deals with 2nd Manassas.  I liked Gingrich's books.  There are two by Harold Coyle called "Until the End" and "Look Away"  James Reasoner has written a series of books that takes a Virginia family through the entire war.  They are named after battles for example I think it starts with "Manassas"  Other titles are Shiloh, Vicksburg, Antietam etc.  I enjoyed them a great deal.
Lt General Jon Thayer
III Corps
Army of Northern Virginia
jonathanthayer@bellsouth.net