Actually a well prepared set of iron heads will out perform any windsor head out here. Keith Craft set many national records with them. Aluminum heads are expensive now prices are going up, the weak dollar has driven the cost up right now but if you have the cash you can't beat The CHI or AFD heads out of Austrailia. Yes Jon Kaase sells them here and Mark McKeown of MME is also a dealer. If you want more info go the the Cleveland forum.
http://www.network54.com/Forum/119419/