Just Blaze
The Neptunes
DJ Premier
Prince Paul
J Dilla
RZA
Pete Rock
Marley Marl
I won't put Timbaland down because even though he makes some good beats all the guy cares about is the money. He also sampled a couple beats without giving the original artist credit. I've listened to the beat he stole for Nelly Furtado's "Do It" and he didn't change shit. To think I actually thought he was cool.