Man, I really like all those designs! Though I would probably go with 2 or 3 for a closed helmet for the knight class and maybe 1 for the man at arms or vanguard.
Managed to narrow down to 3 choices for my helmet concept. With the first one I was going for an Italian renaissance style helm, and for 2 and 3 I decided to stick with a more german medieval look.
So i've combined 1 and 3 in my final-ish design. But i'm tempted to add the decor from the 2 to give my sword a better silhouette from a top down angle helmet concepts to come soon