SpenceEdit said:

Well, the music is going to be from all different sources for the entire duration of the movie.

But, what Ash said is exactly how I feel:

I understand this, but whenever I hear that particular track I immediately think "Whoever picked this is lazy." The original version was perfect for Requiem for a Dream, and the remix was perfect for the Two Towers trailer.

Every other time it's been used since then, I groan. I'd go with something less recognizable, if I were you.

Look:

http://www.youtube.com/results?search_query=star+wars+requiem+for+a+dream&aq=0

821 results.

I highly, highly recommend choosing another piece. Despite your personal feelings about it, I'm just telling you how any Star Wars fan that has seen fan videos on Youtube will see it.