Another thing that struck me, since I'm in the midst of pretend-casting Much the movie, is actress Lily Cole. I think I may have found my Marion. She certainly looks the part. She's also English, which is important, and she has an air of innocence about her that would really sell Marion's naive convictions. So Lily, call me.
Now I'll just need to find out if Rowan Atkinson is free to play the Sheriff.