Recommend me some modern classical music..?

I've long listened to avant-garde rock bands (part of the RIO movement), Olivier Messiaen, Stravinsky, Bartok, Zappa, Samuel Barber, and Ravel. I especially like Olivier Messiaen's Turangalila Symphony. I have an intense fascination with soundtracks to 40-50's television shows and movies. From what I've heard, they are majorly atonal. :)