+1 for Blackstar, and the rest of that.
Um.. the obvious...
Tribe Called Quest
De La Soul
The new Gorillaz album features Mos Def on a couple tracks. It's pretty good, too. Not all hip hop, but just good.
The newest Mos Def album features Slick Rick on a really sick track. Just get The Ecstatic. That's the new Mos album.
Um... Talib Kweli.
The rest of Wu.
Just throwing out what I like.
Check out that thread about the hip hop mixes.