I'll go for it what the hey. 10 huh? k...
Early times:
Sepha,
HeroicCompany,
Golradaer,
Aniketos,
nystr0m
Modern times:
DrHorse,
Seb,
Aimstrong,
SiberianPlatoon,
DevM
d0h 12azor SO close but fail..

There were also times in between there when Mexico, Sweix, Surprise, and Iaguz dominated. They deserve mentions.
If you looked purely at tournament performance, it would probably be these 10:
- Sepha
- nystr0m
- Sweix
- Surprise
- Iaguz
- Dr.Horse
- Seb
- Aimstrong
- SiberianPlatoon
- DevM
Poor Symbi and Ali are on the cusp too.