James Gandolfini, The Sopranos. I remember watching that show pretty much every Sunday. I can't think of a better actor, he pretty much owned that role and hit every note and range of emotion. Plus, I might be a bit biased because he is also from Jersey, and he also helped out the Wounded Warrior's Project, which I also support and think are just great. But I really think that he might have given the all-time GREATEST performance in any television series ever! I also hear that Martin Sheen was fantastic in The West Wing as well.
Adrian Paul/Duncan Macleod