Are you dualboxing? If so, use what you like. Portals are no longer an issue, since you can simply bind in shatt and use the portals there most of the time. Lock has some nice buffs (ok, one buff: water breathing) which makes some quests more easy. DoTs and the Pet are another plus. Mage has CC which isn't that bad either.
In the end the question is: what do you want to play?