Re: The Avengers roster for 2011
For the first movie I'd go with Cap, Iron Man, Thor, Giant-Man and the Wasp as the main team, with Hulk as an antagonist early in the film only to be unleashed to help defeat the real enemy later on. And feature Black Widow as a SHIELD agent & Hawkeye as sort of a freelance agent, the kind of guy Fury himself calls on when he needs someone outside of the SHIELD hierarchy proper.
For sequels bring in Scarlet Witch, Quicksilver, and the Vision at least. In a more perfect world we'd hopefully also eventually get Wonder-Man, Black Panther, Ms. Marvel, She-Hulk, The Falcon, Hercules, Black Knight, Photon and maybe even some of the New Avengers.