Call me crazy, but I saw a commercail for the Elf DVD and it showed a clip from an extra, and (going by looks) Will Ferrel looks a hell of a lot like a young Sonny. Granted, Ive never seen do anything that isnt aimed at the 12-17 year old audence, so who knows if he can really act, but just a suggestion.

EDIT-fix typos.
Holy Hell, I'm typeing like Mike Sulivan