Hrm, I don't really like actors. Just because I can love the roll they play on screen and then I watch the extras and I'm like "wtf??" I am SO different than the personality/socialness that seems to be required to be an actor.
ON screen though, I do like Kate Beckinsale and Kierra Knightly (but I honestly don't want so see her ever play anyone set in modern times. Nathan Fillion is the only person I can stand to listen give commentary or talk in special feature type things.