Obi-Wan Kenobi (Alec Guinness) –Master of the Force, a Jedi general during the Clone Wars who can perform the “Jedi mind trick.” Still pretty good with the light saber. Can make ghostly appearances when needed.
Yoda (Frank Oz) – Little Jedi master; species unknown. Quicker than he looks. Often speaks with nouns before the verbs (e.g., “Stopped they must be”).
Those are your choices. I said it’d be a difficult decision, so may the Force be with you!