Something from WH40K that doesn't look blatantly sci-fi would be nice. Like that armor Sisters of Battle wear, for instance. Or something Chaos-y with blades, chains and banners made of human skin.
Also, a Big Daddy suit. The "Bouncer" one, complete with a drill and a little sister follower to poke corpses you make with a syringe while calling you "Mister Bubbles". Maybe Isaac's suit from the first Dead Space. I liked the second game more, but the suit in the first one was more impressive.
I think I'm more interested in clothes rather than armor. I may be lured back to Skyrim by the prospect of cosplay, but I don't want to roll another heavily-armored character.