Fun poll idea, but...
Hawkgirl? Blech! Have you ever seen that SNL skit on the Superfriends... Aquaman?
On your list I really only see Captain America with a compelling, movie-length story. There already is a Cap. story with the Red Skull that came out in the 80s. There's also a FF movie. Neither had a wide release.
The Fantasic Four should be on your list. I see that as a fun movie. They could even make it a bit campy (like lost in space) since the characters play into that. Heck, have Herbie the Robot in it.
Lobo would make a great movie (ala The Crow). Lots of bastiches to frag.
Ghost Rider, if it was done right would be really cool.