Here are the actors I see for the Avengers movie team:
CAPTAIN AMERICA / SCOTT PORTER
(Ryan MacPartlin doesn't fit well with the mask: I must enlarge his chin, his front and his cheeks to have something.. and it's not really good.)
CAPTAIN AMERICA / JENSEN ACKLES
IRON MAN / ROBERT DOWNEY JR.
THOR / CHRIS HEMSWORTH
NICK FURY / SAMUEL L. JACKSON
BLACK WIDOW / SCARLETT JOHANSSON
HAWKEYE / JEREMY RENNER
HAWKEYE / JENSEN ACKLES
GIANT MAN / JOHN KRASINSKI
GIANT MAN / BRENDAN FRASER
THE WASP / EVANGELINE LILLY
THE WASP / EVA LONGORIA
THE HULK / CGI
Hope you like :)