I've had a favorite book for a long time - called LIGHTENING by Dean R. Kootz - about a Nazi who while testing a time machine Hitler was having build, a soldier goes into the future, meets a paralyzed woman selling her life story in novel form. He finds out the Dr. delivering her was drunk causing her handicap.
He uses the time machine to go back, restrain the Dr., another one delivers her and she is born healthy. He shows up many times through her life at important times to make things right for her.You meet Hitler, Churchill and others as he bounces around time. As are all Koontz books, Lightening is a LOVE STORY with some supernatural like stuff.
His best points are how the paradoxes that occur during this story.
An interesting second is Swan Song by Robert McCammon - read about this one on the web. Very epic in scale like The Stand.
Last of my top three was a whacked out book called SHROOMS - about everything living gets effected by this mutant spore from some mushrooms - the world is covered with mushrooms and they are deadly, and for the major part of the book, you are traveling in a tank with some interesting characters.
BUT STILL - LIGHTNING is NUMBER ONE in MY BOOK CLUB!!!