Aim - Cold Water Music, very relaxed hiphop great with doobs
All of J5's albums all are great, i have never considered J5 to be mainstream, all is intelligent
All the Dilated Peoples albums, i saw them live in london and it was absolutely awesome
Deltron 3030 is a great album, what other del albums can others suggest?
Talib Kweli &Hi-Tek - Reflection Eternal
Oh and do yourself a favour and by the albums, i do never feel guilty copying a mainstream act album, but i have all originals for the non-mainstream acts