Ah yes, I almost forgot to add Brighter Than A Thousand Suns. Its truly one of Maiden's heaviest songs I definitely agree with you.To be honest, I voted for Brighter than a Thousand Suns. I looked again, and wished I had voted for Sea of Madness. Neither of those is the heaviest, but I think Thousand Suns is.
I see Montsegur is not in the poll, is it the heaviest?