I would actually prefer *2* new great helms, one of the flat-topped variety, and one of the more pointy-topped ones with the cross-shaped overlay on the face. And while we're at it, I'd love to have the proto-great helm, which was flat-topped, but only covered the head above the ears with an armored face mask. It was worn over mail and was common during the early part of the crusades, as an update on the norman/spangelhelm.
Also, with Lego coming out with 5 new styles of castle helms, I'd stay away from the sallet, armet, etc, as I'm sure they'll soon get around to making non-dayglow versions of them.
Good Stuff, BM! i'll be ordering a mess of greathelms!