I've got Thaumaturge (BLM), Conjurer (WHM), and Archer (BRD) at 50 already on my main, and I'll continue spending time with them, but when ARR is out, I'm planning on leveling my lancer (which I believe is level 20 right now). After that, I'll run over to arcanist. There are going to be so many people leveling arcanist because it's new right at launch that I figured doing something different will probably be helpful.