I just found this lovely little image with all the guys who ever put on a Batman mask, and thought you guys would enjoy it.. though I think Kevin Conroy will always be my favorite (Such a musical voice)!

List:
1. Lewis Wilson (Batman, 1943)
2. Robert Lowery (Batman & Robin, 1949)
3. Adam West (Batman, 1966-1968)
4. Michael Keaton (Batman, Batman Returns, 1989 – 1992)
5. Kevin Conroy (Batman: The Animated Series, Batman: Mask Of The Phantasm, Justice League, Batman Beyond & Batman video game series 1992 – Current)
6. Val Kilmer (Batman Forever, 1995)
7. George Clooney (Batman & Robin, 1998)
8. Bruce Thomas (Batman Onstar Commercials, Birds Of Prey, 2000-2002)
9. Christian Bale (Batman Begins, The Dark Knight, The Dark Knight Rises, 2005 – 2012

Via.