Public Enemy
Beastie Boys
N.W.A
Run DMC
Tribe Called Quest
The Goats
De La Soul
Am I getting old or something? Early 90's was a very good time for rap/hip-hop whatever you want to call it.
You should check these guys out, Nation of Millions by Public Enemy is still one of my favourite all time albums.
Many people see the Beastie Boys as a bit of a joke, but the music (when you forget about the videos) is awesome at times. the single Sure Shot is great, and Sabotage still makes me grin like a child, great video as well.
Tribe Called Quest are remembered for "Can I kick it?"

You should listen to the album Midnight Marauders to get over that, awesome album.