I love the aforementioned Clint Mansell. His soundtracks for The Foundtain and Black Swan are often on heavy rotation at my place. Other than that I'm not very into the whole soundtrack scene. I do however love the works of Susumu Hirasawa, the music he's done for some of Satoshi Kon's films are absolutely amazing. I'd advise you folks here to check out his soundtracks for Millenium Actress and Paprika. In terms of yer usual Hollywood composers I'm a big fan of James Newton Howard, my favorite being his soundtrack for The Village. It works incredibly well in the film and as a stand alone piece it provides so much more than just background music.