I'm not looking forward to play a Consular. It looks like the only interesting companion, you get on Belsavis.
It will be interesting to start a Jedi Knight. It's the other force-using class on Rep side, but it's written by Hall Hood and so far I'm quite pleased with how he wrote the smuggler. I'm inclined to see his take on the force.
I can't really say much about the Jedi Knight's companions since I haven't played that class yet, but Doc seems interesting for SGR. Scourge.... not so much.