Not sure what i'll roll up.
I've played Norn Guard and Warrior, Sylvani Warrior VERY briefly due to the elevator glitch, Human mesmer and engineer, but never got out of the starter area with the Human.
I liked the Norn, but not sure yet if Guard is for me, i liked the warrior, found it to be rather high octane in comparison to most warriors i play in other games, which i liked. Can't really speak to the other two classes.
I'm thinking i may go either Human or Sylvani to start with, and i'll probably stick with whatever i make then because i find i enjoy a game more if i'm not rerunning the same content 3 different ways in the same week trying to level up all my toons. Only way i'll make another toon is if i get someone to play with me who hasn't already played, but GW2 has such a nice mentor down system i may never feel the need to.