for me personally, Wutang clan is the shit... period.. if ya want get into some shit, pick up wutang forever double cd.. that is a fuckin classic..

some others i listen to...
outkast-atliens (best album from outkast)
method man-tical and judgement day (great albums wit meths witty wordplay and rza beats... how could u go wrong?)
rza aka bobby digital- any of the digital albums are ridiculous
ghostface- one of the best mcs, anywhere
raekwon-only built for cuban linx (a five mic album, classic)
any beastie boys album, cypress hill there are tons of great stoner music, its really up to the listener... but definately Wutang, rip ol dirty...