I would at least like to Spider-Man in the next Avengers. His personality and powers are a good compliment to the team. The rest of them would be superhero overload without an obvious benefit. The Marvel Studios universe doesn't currently support the "superbeings everywhere" status quo of the comics, but if it gradually does then I guess they will be set up for a Civil War-style plot/subplot in the third movie, which seems like the obvious direction they'd go.

