Hulk and Hulk Buster Iron Man. When the first Hulk movie came out TRU had a 14" Hulk figure that was pretty cool. The articulation sucked and was mostly cut joints but for the most part they were well hidden in the natural lines of the muscle. I would be opposed to a rubber suit figure, but I do think a plastic or vinyl figure could be possible.
Maybe if they had hands that were interchangable for poses (as opposed to articulated fingers) and at least two different headsculpts (screaming and scrowling expressions) I think the figure would be a hit. Hell, I'd pay in the neighborhood of $200.00 for a top of the line Hulk figure.