If they kept in period for the film, but went out an a limb a bit for casting, I would love to see something sort of like this:
Stine - Robert Downey, Jr.
Stone - George Clooney
Gabby/Bobbi - Nicole Kidman
Oolie/Donna - Amy Adams
Alaura/Carla - Vanessa Williams
Mallory/Avril - Beyonce
Fidler/Irving - Kevin Kline
Jimmy Powers - Neil Patrick Harris
Munoz/Pancho - I can't remember the guy's name, but he's a prolific character actor playing somewhat comic sleazoid bad guys reminiscent of Danny DeVito (often seen sporting a pencil-thin mustache). Perhaps someone else knows who I'm talking about.
"What can you expect from a bunch of seitan worshippers?" - Reginald Tresilian