Dr. Strange would be a hell of a flick if Marvel pulls it off. Ant-Man and the Wasp I can only see working in Avengers 2, much like Hawkeye did (maybe as SHIELD scientists who discovered how to grow and shrink themselves).
Guardians of the Galaxy would be interesting to see - I'd love to see Marvel attempt a space opera franchise akin to Star Wars or Star Trek.
I'm with Russ re: Starlord, though I prefer the John Byrne/Terry Austin outfit:
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