Rhanfahl:
Choosing Richard Cox for Naruto or Sasuke would be a bad dubbing choice. I agree with that. But I don't think they're gonna do it. Despite what you think, anime dubbing studios aren't total idiots. They're not gonna cast a voice without considering the characters (I'm talking about good dubbing studios, we don't know about Viz just yet...).
Also, what do you mean by "Translation"? Most dubbed anime don't have huge translation errors that would ruin the whole show. If anything, they're gonna have to mess with the dialogue a little, but only to synch with the mouths.
I would personally hate to hear Billy West's voice coming out of ANY anime character. And I'd rather have Steve Blum than Homer Simpson (or Principal Skinner, Krusty, etc, if you wanna be technical). I can name quite a few different anime voice actors who use a different tone in their voice for different shows, but that doesn't matter, becuase their voices often fit the characters anyway. And I hope they pick some good ones for Naruto...