Also liking 1 and 3 - specifically handle and pommel of 1, crossguard and blade of 3. Prehaps round off the gradient into the blade's point rather than the sharp bevel that's there currently?
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.
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