Iron Man!!!

Robert Downey Jr. has signed on to play the title role in Iron Man. Downey will play Tony Stark, the billionaire industrialist/brilliant inventor, who, after a near-fatal accident, builds a high-tech, nearly impenetrable suit of armor that gives him superhuman strength and other powers, which he uses to fight the baddies.
I like this casting as Stark is a character that has fought personal demons such as alcoholism--something to which Downey can relate it. Also Stark has a bit of a dark side, see the ongoing Civil War, and Downey could be the best actor for the character.
Jon Favteau (costar of another Marvel adaption, Daredevil), will helm Iron Man. The budget is said to be around $100 million.