You may already have these on youre list, but I thought of: Ken Grimwood's Replay; Gregory Benford's Timescape; Michael Moorcock's Behold the Man; Julian May's Saga of Pliocene Exile; Terry Pratchett's Johnny and the Bomb. And I'm sure there's an Edith Nesbit book with a time-travel element, but I can't remember which one it is...