Lelouch from 'Code Geass' would be my recommendation. What is unique about his facial expressions is that they are not subtle but yet to some extent, exaggerate. He has shown sadness, evilness, despair, cunning, happiness, utter seriousness and on a certain rare occassion, the first time he ever truly feared something.
. There are plenty more but I can't name them all.
I do all the right things for all the wrong reasons.