Best known for: "Thor," "Prometheus," BBC One's "Luther"
For him: Elba is no doubt one of the biggest names on his list, recently gaining mainstream recognition for his Golden Globe-winning turn in the BBC One crime drama "Luther" and in several major blockbusters including Marvel's "Thor" franchise. His 6'3"-inch frame matches his imposing screen presence - a perfect combo for the character - and as a Brit he also hews closer to the comic-book Blade's U.K. origins (the character was reinterpreted as an African-American superhero in the Snipes films).
Against him: Elba is in his early 40s, which could be older than Marvel is looking for. Also, his involvement in Marvel's "Thor" franchise could be a deal-breaker.