A few that may have not been mentioned yet that deserve to be in the running:
By All Means Necessary
It Takes a Nation of Millions(How this hasn't been mentioned yet is beyond me)
The World is Yours
But yea I think either death Certificate, Resurrection, The Low End Theory, ATLiens, or The Infamous would be my choices. LAD had too much filler though the tracks that were dope were DOPE. Same with IWW. Hard for me to pick an exact favorite..all of those albums do something different and do it WELL.