Tony Stark has a problem. No, it’s not a money avalanche (seriously, that dude is loaded). No, it’s not having women throw themselves at him. It’s his heart. He’s got chunks of metal embedded in his chest, you see, and without the Arc Reactor-powered electromagnet mounted on (or in, depending on the continuity you’re following) his chest, that shrapnel will pierce his heart and end his life. In the film, Iron Man, Tony builds a second Arc Reactor when he gets back home and discards the original. But his assistant (Pepper Potts) saves it, and therein lies this beautiful replica. The Iron Man FX Arc Reactor ($150).