Aluminum heads $ per HP?

let's say the short block is a flat top pistoned,leveled decks,509 hyd cam,basic 587 heads with2.02 intakes and clean up after the larger seat is cut,cast iron 1.5 adjustable rockers,air gap with a 3310. WITHOUT porting and matching ports,what would be the increase with each different brand of cylinder currently available? and to throw another monkey wrench in the works,which head would have the greatest potential?