I vote a Monkey Island movie if the writing team stays the same from the games to the movie.
And a Legend of Zelda movie made by the people who made the Lord of the Rings movies would be interesting in my eyes as well.
EDIT: And, just because I thought of it when I was younger, a Mega Man movie (based on the original series). Course, don't use the people I had in mind when I was younger. I had Macully Culkin (or however you spell his name) as Mega Man, Hulk Hogan as Guts Man...and the only choice I could stick with if he's healthy enough: Christopher Lloyd as Dr. Wily.