I'm about to give away that I'm a complete Star Trek newbie, but I can't get enough of Chris Pine's latest depiction of Kirk. Star Trek was something I always watched a little of growing up, and knew enough about to get pop culture references and the like, until the Star Trek film reboot hooked me!
Jean-Luc Picard, I think. He didn't fit the charismatic, handsome model and picking a Shakespearean actor was a brave choice that worked out well. I think he is most believable as a (space)Navy captain.