In no particular order
Steven Jay Blum
Noticeable roles
Rurouni Kenshins Makoto Shishio
Narutos Zabuza and Orochimaru
Cowboy Bebops Spike
The Big Os Roger Smith
Ive gotta love a man who has such range. He goes from Digimon Adventure 02s Black War Greymon to Digimon Tamers Guilmon to Narutos Zabuza to Narutos Orochimaru to the pure evil Shishio of Rurouni Kenshin.
Sean Schemmel
Dragonball/Z/GT: Son Goku, Nail, Kaiô-sama
After moving back to New York to work mainly for 4Kids Entertainment, Schemmel has finally shown he can do more then the greatest Saiyans childish attitude. I quite like his Professor Chronos (Yu-Gi-Oh! Duel Monsters GX) and his various other roles.
Maile Flanagan
Her only Animé role maybe Narutos Naruto Uzumaki but Flanagan has sold me with her performance as everyones favorite underdog future Hokage.
Brad Swaile
Swailes best performance seem to be his role as Amuro Ray in Chars Counterattack and the original Mobile Suit Gundam series.
Dang, this is far too much a task for me right now (tired from school day). Ive many more favorites, like Chris Sabat and a lot of others, but alas, I stop here.
Oops, I wrote this before finding out this should be more narrowed down.
When it comes to male/female, my favorites would have to be Stevne Jay Blum and Kate Higgins (Naruto's Sakura).