lately i've been really interested in the old memphis devil rap scene. most of the songs have crazy fast flows that use a really aggressive triplet pattern that i like hearing in rap. a lot of cheap production on early 00s tracks, which means lots of synths that sound like straight up general midi and distorted vocals. it all makes for a very interesting and distinctive sound !
I have been listening to some memphis rap also, mostly mixes by legowelt: http://awolfe.home.xs4all.nl/mixes.htm
Legowelt himself makes some good music too