Can't disagree with any post so far but I'm very surprised to only see Prince Paul's name in their once. To say he was a seminal name in the scene back then would be an understate.
On producers in general I also enjoy Dr. Dre, The Neptunes, Rick Rubin, 9th Wonder, DJ Premier, Timbaland, Hit-Boy, Eminem, Pete Rock, and Scoop Deville