ican see it.  depp has the ability to play a guy whos nuts but doesnt seem it.  if you understand what i mean.....
 
let me rephrase...........he has good acting range.  he can be serious, funny, nuts etc.
 
if someone has a pic of jd with slicked back hair then we can see.  i think people are goping for weaving because of his look in the matrix films.  jd would be a better choice because he is a bigger name.  then we can have a gl who is not, and hopefully it would work as the formula has with the first batman (nicholson/keaton) and SR (spacey/routh).  
 
i would like to throw another name in the ring, Willem DeFoe, but he probably wont be considered because of the S-M films.  i just think he has the sinestro 'look'.