Here's an optimist:
http://cgi.ebay.co.uk/Model-1867-Other-Ranks-Prussian-Germany-Pickelhaube-/150552138707?pt=UK_Collectables_Militaria_LE&hash=item230d9b53d3
It looks genuine and unmessed with, so even in its battered state, not a bad thing. But something tells me this one won't sell any time...