The Def Jam Music Group 10th Anniversary Box Set was all we listened to in college for the most part.... other than the few things I own (below) there isn't anything out there I like now.
Grandmaster Flash and White Lines... some good stuff there. Can't beat Cypress Hill (the self titled album) (I have that, Black Sunday and IV) which is about as close as I get to hardcore rap. Beastie Boys is just fun.. just reminds me of being young and rapping along on the bus rides to school. Some stuff from OutKast (which is funny because I only found about them from that damn song Hey Ya that was played and over played and over played again).
Otherwise most of the new modern hip-hop gangsta scene just turns me off.