Soon to come as controllers: Psion (Psychic) and Seekers (Primal, yeah, another one). Even if we have half the class in the character builder, I don't think they will be allowed until PHB3 is out.
If you're insistant on doing a controller, I would suggest going with Wizard. I know there are already several wizards in LEB, however, with as varying and widespread as the races and different Wizard spells/rituals are, with a little bit of fluff work, you can create someone who is remembered for WHO they are, not WHAT they are. Both of the d'Sivis wizards are illlusion specialists, so if you were to go with something else, you can create a wizard that is completely unlike the other wizards in LEB.
FYI: A dragonborn druid from Q'barra would fit the isolated theme: The jungles of Q'barra were pretty remote until a group of high-minded nobles from Cyre butted in 20-40 yrs ago and moved in.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.