Acrobat
Witchhunter
Healer
Nightblade
Assassin
Spellsword
While I have little in the way of ranged attacks, aside from what the Witchhunter and Spellsword can do, and have no real "tank," I like to comprise my party to kill extremely quickly, hitting from all possible angles at every possible chance, hence why I have the Acrobat, Nightblade and Assassin.
What's your ideal group for the upcoming MMO, providing it keeps these classes.