They already did Hulk... I really can't imagine Captain America being anything but overly cheesy... and he needs Nazis or Soviets. I can't see the Red Skull as an Islamic terrorist.
I agree Thor would be cheesy... but I'd still want to see it.

What about the less important Avengers who don't have their own comics (to my knowledge... SS may prove me wrong) like Hawkeye or that Wasp chick?

Really I want them to do Dr. Strange. But I don't see that being anything other than another straight-to-video (Like the little-known Man Creature or whatever it was called... kind of a Swamp Thing type only mean... never heard of it before the movie, but that was apparently Marvel).

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"Man lives in the sunlit world of that which he believes to be reality. But unseen by most is an underworld, a place that is just as real... but not as brightly lit... A DARK SIDE!"
-opening from Tales From the Darkside