Moon Knight
is number one for me, namely because it both ROCKS and makes sense to do as a picture, unlike...
Venom
I'd love to see a Venom film with a cameo by Spiderman and with Carnage as the main villian, but I just don't see it happening. Oh well. If Elektra can get a spinoff and a Daredevil cameo, maybe... just maybe.
The Ultimates
This is so ripe for a 3 picture franchise I could just scream. While I do see some form of the Avengers mixed with The Ultimates hitting the screen eventually(especially once they introduce most of the characters in their own movies) we all know that it won't be a direct adaptation of The Ultimates.. one of the few Marvel books that could use a direct adaptation.
And my super duper dream project that will never happen in our lives:
Earth X
Because it freaking rules, people.