I like to have some progression in my character, gives the exile some depth. ie, been in disgruntled exile and stubbornly abides his past mistakes and views the jedi with contempt because he believes they are the reason he lost his connection to the force. So at the start he's self absorbed and cynical, not evil though, just misguided. Then as he reconnects with the force he comes to understand how he was wrong and learns what it means to b a jedi.
So basically lightside, but i like to give it some genuine motivation, and not blindly always be self sacrificing and being a pitiful goody two shoes. That, and lightside makes the game more challenging.