OMG KATE BECKINSALE!!! *thud*
Nah, wasn't thinking of making a movie version of the musical, don't worry.
(Right, I admit Gerry Butler is no great singer (though he doesn't have to be afraid of a comparison with Colm, in my opinion), but I think he's a great actor.)
He's more or less the type of Valjean as I imagine him, though he'd have to wear a wig of course for most of the movie.
Though it might be difficult to find a Javert who's clearly taller than him...