I definitely got to play some arena this weekend, and it was awesome. So here are my votes for best by class.
Pally: Sessha something. I really can't remember name, but his ability to survive is excellent.
Zerk: AXE, Kinglazyass both are very good. I'd say atm AXE is better just because of his ability to mvp over King.
Wiz: None. I saw one 38 wiz. That was it >.<
Necro: NightHoshi, and Blacksomething.
Ranger: Something like Purina. Anyway +15 bow = win
Sin: Edword, and me?
Cleric: Izrel - his heals were awesome. He could really keep a person alive.
Sage: Scar and Homurah.