Should probably be in the gaming/media section as it pertains to music but Eminem jumps to mind immediately, not because he's my favorite but I've heard more from his discography than any other rapper due to his popularity (particular since I didn't start paying attention to music until five or six years ago) and the fact that he was the first rapper I liked and as such, the first one I went out of my way to listen to. Typically, I never really delve too deeply into any artist, at most I'll listen to all singles and maybe their best rated at album and I can't say I've gone that far for any rapper but Eminem is the one I've gone the farthest with. He's still on my list but I'm not sure I'd say he's my favorite.
Anyway, the other favorites, which I've had significantly less of, would be Immortal Technique (Mistakes has my favorite lyrics in just about any song & I just love everything about You Never Know), Bone Thugs-n-Harmony, Tupac (Changes may just be my favorite rap track), B.o.B. (extremely hit and miss but still I really like the ones I do and I've probably heard the second most from him [sadly (Yes, I'm aware how easy it would be to change that)]) & Atmosphere.
