7. Jesse Eisenberg
Jesse Eisenberg may seem like a weird choice for this list, but remember that zombie apocalypse movie with that guy? Well one of those zombie movies was Zombieland and "that guy" was Jesse Eisenberg, the young protagonist with all the tips and tricks on how to survive. And he killed Bill Murray in that one, so I say he's totally up to take the guy's place in Ghostbusters (it's totally Oedipal). A lot of people (who aren't cinophiles) will mostly remember Eisenberg for The Social Network, but between his roles in Zombieland and Adventureland and the more recent 30 Minutes or Less and To Rome With Love, the kid's got a nice wide span of talent and plenty of potential still, he's not even 30! Old enough to hold up a franchise that already has a dedicated fan base and a lot of history, but young enough to make more movies after this one if all goes well.