"It may have been yours, perhaps... But never mine. And even now, as the darkness takes me... I am nothing."
Seriously, it's one of the best games I've ever played. Really customizable and gives you so many options with whatever path you want to go down. Really good, really well designed.
Although I like what I did, once I realized I was Revan I didn't go down to the dark side, more just use more dark things, such as Sith Robes and lightsabers.