I'm not really a director fangirl, but here's my attempt at a list. The top 10 are the ones I really admire and love to watch.
1. Paul Thomas Anderson
2. The Coen Brothers
3. Woody Allen
4. Alfred Hitchcock
5. Pedro Almodovar
6. Orson Welles
7. Michel Gondry
8. David Fincher
9. Wes Craven
10. Alfonso Cuaron
11. Wong Kar-Wai
12. Stephen Spielberg
13. Judd Apatow
14. Michael Moore
15. Stanley Kubrick
16. Sofia Coppola
17. Edgar Wright
18. Alejandro González Iñárritu
19. Rob Reiner
20. Milos Forman