If you're looking for a soundtrack that's more than 'background' music, get the Fight Club soundtrack. Fantastic electronica.
Also, Clint's work on Pi is his best work from what I've heard. I love the "beep beep" and that pounding techno when Max Cohen is being chased. Wish he released them.
OH YES I heard he once released parts of the full Pi score and then it got deleted or something? ANyone knows?
BUTTTTTTT In case we strayed off topic I'd like to point out "UBLUD" has annoying backdrop, although it has a cool enough chorus.