Just another GR refugee. Other than that, I had a stroke in 2004, and read almost anything I can get my hands on, though I have a particular weakness for history, mystery, and historical fiction.
This one is hard. I ended up just kind of picking randomly from books I've loved and think are first-class.
Battle Cry of Freedom: The Civil War Era, by James McPherson, is the best single-volume history of the American Civil War era I've ever read. A stone-cold masterpiece of historical writing. The historian in me is very jealous.