I posted this at the Morphorums last year sometime, but I figured I'd post a shill it here for Crispin Freeman, who I feel is the greatest anime voice actor out there.
Animation voice demo
That link is an mp3 file where he showcases some of his various characters that he's done the voices for. Alucard (Hellsing), Hideki (Chobits), Amon (Witch Hunter Robin), etc.
Awesome, awesome voice actor and by all accounts, a brilliant, intelligent man. Check his website--he also did a Zest soap commercial, I think.