I'm gonna say Ampichino because his success comes from pure quality music not gimmicks or image. He has used his consistency to not only have the midwest go crazy for his material, but my neck of the woods as well, the Bay Area.
Gotta be Tech N9ne without a doubt, he made a lot of big moves and dropped a lot of good projects this year. Just because Eminem had 10 Grammy nods doesn't mean shit, his album sucked.