What about biographies of his favorite people? How about the "classics"? Another thought - travelogues ("A Walk Across America" - old title, but excellent comes to mind)? Anything by Bill Bryson (humor). Old time mysteries - Dashiell Hammett ("The Maltese Falcon"), Rex Stout (Nero Wolfe series), Agatha Christie...so many others. "Seabiscut" or other sports titles? I agree, "Unbroken" was an excellent book.
What is your DH's favorite genre? If you can, go to your local library and browse the shelves to get more ideas. God luck!