no way Eminem should be anywhere on this thread lol, I like way too many to name the best so heres my hounarable mentions(spelling?) in no particular order lol

Gangstarr-Full Clip and more..
Big L-The Big Picture
Cage-Hells Winter(not the best but still really good),check him out if you like eminim.
Danger Mouse and Jemini-Ghetto Pop Life
MF Doom has crazy lyricks check out Dangerdoom ft.Talib Kweli Old School off The Mouse & The Mask cd.
Louis Logic- Sin-O-Matic is alright
ummm thats all I can think of right now