One trope I think that should be avoided at all costs is the 'anti-venger' pair-offs. An arc to play with on would not just be the 'round robin' of powers, but a one-sided slip of empowered supercharging the powerless. Banner and stark are both geniuses, but if Stark hulked out in his Iron-man suits every time his adrenaline levels spiked, it would make for an interesting story.