Kotobukiya Classic Avengers Iron Man---1 heads, Helmet on, Helmet off.
Kotobukiya Edward Norton Hulk---2 heads
1) Jaws closed but bearing teeth. (2)Mouth opened.
Kotobukiya Jim Lee Wolverine Fine Arts Danger Room statue---2 heads: Masked on, Masked off.
Kotobukiya Jim Lee Fine Arts Danger Room statue----2 heads.
Inset is alternate head.
Pic from toytards.com