Personally, I'm a fan of the late 12th century (Third Crusade era) great helm for a knight, nothing flashy, just a nice clean look that fully protects the head and upper neck.
The full plate doesn't really make me jump out of my seat, but at least it's semi-realistic and not adorned with all sorts of pointy objects, spikes, horns, etc. that would impair one's ability in combat.
The other armors look OK. I do like the use of maille.
All I can think of when I look at the emblems on the shields is Byzantine Empire... Would be pretty nifty if the shield textures picked up a custom heraldry for your empire that you can create by either uploading an image or using an in-game editor. Don't know if that's been mentioned before.