I work at a library, and I requested and received The Anthology of Rap. It's an amazing volume. If you're interested in the history of the sweet science of lyricism, then it is a must.
My favorite rapper is MF Doom, because listening to him rap is amazingly similar to eating really good food. His rhymes are almost tactile.
Do the denziens of the CM Fourum-World have a rapper they prefer? Or a style they adore?