$80 bucks for steel and $250 for bronze? Well, I'd go the steel route too. Almost took an art class in college. Was thinking of making a helmet like that and some spear points. Bring in a bunch of old pennies for your copper and some tin (from cans) and voila! Bronze. That helmet would be good for a mold for a project like that. Difficulty would be a continuous pour of such a large object with small equipment. I suppose the real helmets started as sheets, were annealed and then hammered into shape.
2nd photo is nice too. With your beard that is correct for the Greeks. BTW, the Lacadaemonians/Spartiates/Spartans wore their hair long.