I've recommended most of these hundreds of times before, lol, but anyway, this should keep you busy for a while:
"Enter The Wu-Tang (36 Chambers)" - Wu Tang Clan
"Moment Of Truth" - Gang Starr
"Liquid Swords" - GZA
"Only Built For Cuban Linx" - Raekwon
"Capital Punishment" - Big Punisher
"The Infamous" - Mobb Deep
"From Where??" - Mad Skillz
"Midnight Marauders" - A Tribe Called Quest
"Stakes Is High" - De La Soul
"Sun Rises In The East" - Jeru The Damaja
"Livin' Proof" - Group Home
"Aquenimi" - OutKast
"Illmatic" - Nas
"It Was Written" - Nas
"Word... Life" - O.C
"Ready To Die" - Notorious B.I.G.
"Black On Both Sides" - Mos Def
"Blah, Blah, Blah" - Blahzay Blahzay
"Realms N Reality" - Cella Dwellas
"Lifestyles Ov Da Poor And Dangerous" - Big L
"The Realness" - Cormega
"Legal Hustle" - Cormega
"Dont Sweat The Technique" - Eric B. & Rakim
"Stress: The Extinction Agenda" - Organized Konfusion
"Internal Affairs" - Pharoahe Monch
"Magnum Force" - Heltah Skeltah
"Thats Them" - Artifacts
"4... 5... 6" - Kool G. Rap
"Keepers Of The Funk" - Lords Of The Underground
"Enta Da Stage" - Black Moon
"D.I.T.C" - D.I.T.C.
"Project F.E.T.U.S" - One.Be.Lo