Goku (Japanese) - Masako Nozawa
Goku (English) - Ian Corlett
Goku (English) - Peter Kelamis
Goku (English) - Sean Schemmel
Goku (English) - Kirby Morrow
My judgement:
Masako Nozawa > Peter Kelamis >>> Ian Corlett >>>>> Kirby Morrow >>>>>>>>>>>>>>>>> Sean Schemmel