you are just going to have to find items and them test them out yourself then. I mean, I don't see why the Dragon helm doesn't fit for dragon armor in your opinion so I can't really help you and I am not sure anyone really could. The armor itself is extremely spiky so I don't see much really matching up with the armor itself other than something equally spiky. I like Ebony helms, daedric, dragon, dragon priest, etc.
If you are in it just for visuals try no helmet at all then you can see your character's features?