Eldee, I loved Requiem for a Dream. A tough film to watch, but unforgettable, and as you said, ultimately about the universal human need for love. Excellent acting from the entire cast, and virtuoso direction and cinematography.
I also liked Pi: Faith in Chaos, the first film by Darren Arronofsky (sp?) the dir of RfaD. Have you seen it? You might like that one too.
edited for foolish typo