I've changed my calculation method (simpler now) and attached an excel sheet with some test numbers on the low end and high end. The high end stuff are all jokes, if you can't tell, except perhaps Titans and Adamantium. I just wanted to see if the 1.75 rating works for one and 2.0 for the other, and I think it does. At higher levels, you might buy a high HP item for a fraction of the price of a high damage item, but is that a bad thing? At least that way, you can survive for a while in a good fight! And as for whether the +200 mana and -100 hp -50 str -50 def is a good piece... just think "summon a balrog for 1000 mana? Yessir."