In Tim Burton's Gotham it's totally believable to me that a normal guy like Michael Keaton could be the badass called Batman.
Kilmer and Clooney? Too many costume changes. Too ... nippley. Chris O'Donnell was a decent Robin, but Alicia Silverstone? Please.
I never bought into Bale as Batman. To me he just isn't believable. I don't like the suit either. Not one little bit.
Conroy will always be the voice of Batman to me.
Adam West IS Batman.