I'm normally a metal/punk listener, but pretty recently I've been getting into rap, and I'm really enjoying the capacity for complexness, though few that I've listened to seem to capitalize on it.
To give you an indication of what I might be looking for:
So far I've been impressed with
-Eminem (obviously, everything about this dude is insane, his flow, his lyrics, everything)
-Earl Sweatshirt (Has some loving sick ass lines, not a huge fan on how some of his songs "sound" though, good flow, a lot of potential as well.)
I've also liked the sound of several artists
-Eminem (again, flow and production is top notch)
-Kanye West (Great production and flow, but lyrics are mediocre most of the time)
-Watsky (Flow is good most of the time, production is hit or miss, lyrics are mostly mediocre)
-Tyler, The Creator (Flow is great, production is good, lyrics range from good, to ok, and I like how introspective he can be)
Tech N9ne (Flow and lyrics are pretty good, production is hit or miss)