dre is overated,
em sounds the same with his sad beats he uses to express hate
neptunes are crazy producers, but don't bring beats hardcore enough
kanye west is pretty good, but high voices start to get a lil annoyin after a while
swizz is ill probly the best out of all those you named
here are the real producers in order
large proffessor
pete rock
hi-tek
the rza
and the god, Dj Premier