Aesop Rock... all CDs... but if I had to pick one, it would probably be Fast Cars, Danger, Fire and Knives.
Apathy - Eastern Philosophy
Black Eyed Peas - Bridging the Gap
Common - Be
Dilated Peoples - Neighborhood Watch
Gang Starr - Moment of Truth
Ice Cubes Greatest Hits (Although I NEVER understood why Ghetto Vet isn't on it, it is his best song IMO)
Juelz Santana - What the Games Been Missing
Jurassic 5 - Power in Numbers
Ludacris - Red Light District
Styles of Beyond - Megadef
ANYTHING by Outkast.
Scarface - The Fix
The Beatnuts - Milk Me
Fort Minor - The Rising Tied
The Streets - all 3 cds... Original Pirate Material, The Hardest Way To Make An Easy Living, and A Grand Don't Come For Free
Twista - Kamikaze
Wu-Tang Clan - 36 Chambers
There is my short list