Vin Diesal would either a good Nappa, or Frieza. Even though I don't see a horrible show (I used to like it, don't know what put me off about it) making a good movie. But I still think it'll make enough money in the theatre to even out due to the fan following.
EDIT-- I saw there was an actual DBZ Live Action movie on sale, had Asian actors and actresses in it only and looked like a straight to video thing. It was in a store near Fulton St. called Bargain Bazaar.. (as if there are many ppl here who'll know where that is...
)