I'm a lot more fond on the Japanese voices. Raito sounds way too generic for me. L has a bit of a robotic voice :/ Ryuk's is ok, but it doesn't have the same playfulness as his Japanese counterpart >.< I still prefer L screaming about Shinigami in Japanese.
I know for the Japanese voice actors I was worried when they cast Raito's voice actor as the same one who played Tamaki (Ouran), but it turned out really well biggrin
I'm really wondering what Near and Mello will sound like.