Well in the Expanded Universe, he isn't dead, he almost at the end can turn on his jetpack and get out of the Sarlac, and he fight with Luke Skywalker when the last one is a jedi master.
mmm i gonna choose the Jedi's way but i'll be like Qui Gon Jin, a rebell that always defy the Jedi's Council orders and be a master of the live Force, just like him.
I downloaded the two for the PC!!! I have he first one in xbox but the second i never found it, and a month ago i downloaded and is awesome, i've already finished KOTOR2 in the Light side, and now i'm playing like a true Sith!!
Darth Nihilus is the most scaring Sith in all Star Wars but in the game KOTOR 2 he's a simple filler in. But he's great and, if i'm not wrong is the only character that speak the ancient Sith language