I'm so happy! I can't wait for the English dub of Vampire Knight to come out. They've just announced the English voice actors cast last month, and I'm so excited even though a release date for the English dub of the anime hasn't been made public yet. The English voice actors for the main characters are:
Left to right: Zero Kiryu, Yuki Cross, Kaname Kuran
Zero Kiryu - Vic Mignogna
Vic Mignogna has an extensive list of well-known anime he has done voice acting for. But I like him best as Tamaki Suoh in Ouran High School Host Club and Kurz Weber in Full Metal Panic! I know Vic's voice to be quite versatile, so I'm positive he'll do a great job being Zero.
Yuki Cross - Mela Lee
Mela Lee was also the voice behind Hiyori Sarugaki in Bleach. Honestly, I found that little Vizard's voice quite sharp and annoying. I haven't seen any of the other anime where Mela Lee was part of the voice cast. Hopefully she can modulate her voice so Yuki won't sound like Sarugaki.
Kaname Kuran - Ethan Murray
Ethan Murray was also the voice behind Mao in Code Geass: Lelouch of the Rebellion among many others. Remember the one who could read people's minds? The one who was killed by C.C.? Mao sounded a little frantic most of the time, but Kaname should sound cool and composed.