Big difference between this BD and silly thing IMO. This figure is tied to the Avengers movie, and is very distinct and unique among all the other armors being fully battle damaged.
Silly thing is ridiculously out of scale and really appeals to a IM collector after ever armor. If silly thing is still grabbing $1,000+ now with the small amount of collectors wanting that, I think it is safe to say this piece will be right up there with it. The appeal of this suit is with IM and Avengers collectors so much more of a potential buyer pool.
After seeing the mark VII in color as good as that turned out ( minus the head) and what it is going for, this will safely be a higher priced if not the highest priced suit to acquire. Toss in the limited availability and how fast it sold out, the facts are pointing a double up arrow on the market watch.