DJ Premier is the best. His monotone, simple loops and scratched choruses is a formula that has created so many classic beats I can't even count them. Only Gang Starr albums would be enough, but his work with Jeru, Nas, KRS etc. make him the greatest ever.
Timbo at his finest just does something to me. I mean I have other favorites but Timbo would have to be #1. Idc what genre you like, as soon as those Timbo drums kick in and that bounce knocks you bound to nod your head.