#1 ranger
after that im not sure, it also depends on what lvls you are counting, alts etc.
would say
#2 rogue
#3 one of the 3 tanks (or maybe bards)
but i could be totally wrong here its hard to say and i couldnt find the list from a longer time ago
but overall you should play what sounds most fun for you
http://wiki.project1999.org/index.php/Character_Classes
heres an overview on all classes with some explanation on what their job is etc.