I voted Pac.

Poetic Justice w/ Janet was the sh*t! . His role in Juice was that good IMO, and potrayed the role to a tee.

Second would be a 3 way tie for me with Will, Mos & Latifah all 3 have tremendous skills and can just flat out act.

Will sh*t! from Fresh Prince to The Pursuit of Happyness has delighted the screens allover the world for years.
Latifah sh*t! I think the ONLY reason why I liked Moulan ROuge was cause of her.... How can you not like her role in Set it Off...
Mos Def this dude if all goes well for him I see an Oscar for him taking that he goes a straigh and he gets the right roles.

From then on I would say EM, Cube, LLCoolJ & Ice T.