It's tough.
I was really on American Gangster. I really enjoyed much of the Blueprint.
Reasonable Doubt was awesome, but a little before my time.
I really like the one Volume with "It's Hot"--the diss at 50 that made me smile.
But, yes, just because of everything surrounding it...The Black Album
It's probably because he released it at the very, very end of high album sales....and riiiight before ringtone rap. He got everyone to know all the lyrics to all his songs. Somehow everyone knows each song on the album if they hear it.
That is rare. And the content was quite good. Simple rhyming, as always (well except for American Gangster) but awesome content.