Honestly they all look pretty damn sexy... I love how most of the classes in the game are actually really close to already existing MMO's but at the same time have this huge unique twist to them, I think Alchemist or Gunner would be the coolest ones to unlock since they seem really cool, but Berzerker has a giant chainsaw sword..
In all RPG's I play with the archer,like the mystic between the power for the arrows and the traps that class offers and like can kill and dodge as Archer 's it is a dps where speed and dexterity are more important.Already played in many games but the archer in this game as well as is very dynamic and could also prove our dexterity in a class that I always liked to play and I have a sincere passion for bows.
The class I enjoy the most is the Slayer, reminds me of God of War, also besides having the looks of a though warrior also has a litle touch of "ninja" wich is my favorite class in most games. Besides all the other classes with big aoe's, and REALLY awsome effects, I think this one stands out for his simplicity and combos wich makes the gameplay enjoyable.
I'm going for Witch simply because i have never played caster class in any mmorpg which have actual witch vibe (and look) going on. Really excited ^___^ Cheers!