I think as far as Iron Man popularity goes, once a collector buys a second Iron Man armor--whichever one it is, it doesn't really matter--they'll have a hard time avoiding any future variants. I mean, if you bought the the Mark IV as your first iron Man figure but then you decided to pick up the Mark VII as well because it was so cool in Avengers, why not go after the Silver centurion after that? And once you have Silver Centurion on pre-order, why not Heartbreaker? And the Mark 42 does make an interesting contrast with the standard armor colors...it's a slippery slope. I'm trying to be incredibly selective when it comes to Iron Man, myself. I pre-ordered Silver Centurion, I'll be picking up a Mark 1 vol. 2 eventually, and after that I'm on no hurry, but I might be willing to add one more armor as long as it's sufficiently different from the others.