Although, I'm quite fond of Sage Francis and his colorful metaphors, I think one rapper is missing on your list: Doseone.
His wild stream-of-consciousness rap running from brain to mouth always take me out. The albums with cLOUDDEAD, Subtle and especially Circle which he did with Boom Bip are utterly amazing. In addition he did great things with Deep Puddle Dynamics, 13 & God and Themselves as well.
But of the ones mentioned I have chosen Aesop Rock. His lyrical universe is quite unique.
Mf Doom is aite, sage francis is aite as well.my favorite is Madlib. His style is heavy and his rhyming ability is unique. Edon is sick as hell to he puts images in your head that he could only do. You missed sum underground