My Top 20 Emcee's of all-time! Let the debate commense!!

Ok, my brain would've exploded if i had to try to put this list in any particular order. I did the best I could with that but these are definitely my top 20 of all time. Agree or Disagree??? Let me know either way. But please explain yourself. Thanks!

P.S. Note: @oscool ....NO Lil Weezy!! LOL

1. Jay-Z
2. Nas
3. Andre 3000
4. Notorious B.I.G.
5. Eminem
6. Mos Def
7. 2Pac
8. Common
9. Ice Cube
10. Rakim
11. Scarface
12. Lupe Fiasco
13. Slick Rick
14. Talib Kweli
15. LL Cool J
16. Raekwon
17. KRS-One
18. Snoop Dog
19. Chuck D
20. Black Thought