Demigodz:
Rise
Celph Titled
Apathy
Louis Logic
Majik Most
C-Rayz Wallz

^ My favorite is of the bunch is Rise, I have three of his albums.. kid is insanely ill.

Others-
PackFM
Tonedeff
Copywrite
Cunninlynguists
iCon The Mic King
Atmosphere

ehh. . there are more, but i'm lazy.