The Old Republic
I finished Onslaught with my Inquisitor. I did the Meridian Complex instance, and then the final conversations. I rejoined the Empire, killed Darth Anathiel and retook the Dark Council seat.
I really enjoyed how they referenced the original story here. Made a lot of sense for a Sith lord. It was really nice being called Darth Occulus again.
So that's Imperial Agent, Jedi Knight, and Sith Inquisitor all caught up. I'm not sure which class I will level next, though it will probably be a Republic class. However, maybe I'll take a break from The Old Republic for a bit.