like Rowe said, its about inches and u try to add as much stats as you can. Now if that extra money could be put to better use, eg. upgrade from eof 6 to eof 7, then do that first. But end game bof 3 slot will justify itself. And on a side note, you'd might aswell be comparing bof 5 to bof 3 slot cause thats a closer dmg difference than with bof 4, but the scenario is still the same.