So far, Keira Knightley, Alice Eve and Emily Blunt are under consideration. Blunt is known to be a favorite of Marvel brass She was offered the role of Black Widow in Iron Man 2, until Fox exercised an option it held on the actress and put her into Gulliver's Travels. Scarlett Johansson took the role.
Michael Cassidy won the last poll with an underwhelming 6.2 out of 10 on our scale. Perhaps these ladies can generate a bit more enthusiasm?