Current Ranks:

1. Newbie
2. Beginner
3. Rookie
4. Decent
5. Getting There
6. Average
7. Intermediate
8. Awesome
9. Advanced
10. Skilled
11. Pro
12. Hardcore
13. Prestigious
14. Expert
15. Veteran
16. Sublime
17. Beast
18. Epic
19. Addict
20. Elite
21. Insane
22. Nightmare
23. Stoner
24. Legend
25. Hax0r

My recommended ranks:

26. Great 6150xp
27. Amazing 6300xp
28. Fantastic 6450xp
29. Supreme 6600xp
30. Extraordinary 6900xp
31. Magnificent 7200xp
32. Master 7500xp
33. Monster 8000xp
34. Insane 8500xp
35. Lunatic 9000xp
36. Unstoppable 9500xp
37. Unbelievable 10250xp
38. Incredible 11000xp
39. Demonic 12000xp
40. God / Godlike. 13000xp

Max rank should be God or Godlike whatever the levelcap is
Those are my suggestions