first the actors who we already know about:
hulk=edward norton
thor=chris hemsworth
iron-man=robert downy jr.
nick fury=samuel l. jackson
black widow=scarlet johansson
now who i think would be cool to have in the movie:
giant-man=matthew fox (he is just so good on lost)
wasp=kate beckinsale(i mean she is just so hot!)
scarlet witch=sarah michelle gellar(c'mon she was buffy)
quicksilver=ian somerhalder(i think him and sarah look alike and are around the same age)
hawkeye=milo ventimiglia(why the heck not)
the vision=doug jones+cgi/voice=hugo weaving
ok now for cap.....
captin america= chris egan(ok so cap would be a young guy right and this guy was good on kings)
ok so let me know if i done good!