Cam'Ron VS Nas (Killa killed him)
The Lox Vs Memphis Bleek/Beenie Sigel
Royce Da 5'9" Eminem
Fab vs Ali Vegas

You may hate on this one but this could actually be top 5 all time.......
Nas/AZ (The Firm without Foxy) Vs Cormega (they knew eacother so well that they were getting into each others personal lifes and going hard every time Nas and AZ won cause they were better rappers but Cormega stepped up and traded shots for a while)