i think MK6 design will be in 2012 avengers, becuase triangle arc piece is the new comic book design. so if you buy now, you have a good chance to have your team avenger
if it's 14xx, than go ahead and buy fast, 1 figure 2 display mode i think it's very good deal.
As for the chest armor, it's not that big of a problem, it doesnt fit perfectly but you probably wont display him in BD mode, even so, you can use blue tac to stable it.