Plenty of people have jumped in before I got a chance to address Muzicsculp's tongue-in-cheek, but otherwise legitimate query. The discussion has taken a turn as is customary in the forum and I would attempt to make some practical sense of it.
Suffice to say that modern symphonic music is not in competition with film-music in any way - never has been, especially quality-wise. All one has to say is Bach, Mozart, Beethoven, Wagner, Brahms, Stravinsky, etc., or even just Bach, or Mozart, or Beethoven, etc., and the discussion ends before it even begins.
It is exactly the opposite. The greats of film-music (Steiner, Herrmann, Williams, Goldsmith, Jarre, Morricone, et al.), they learned their lessons from having studied the masters, and applied the techniques of serious symphonic music to their soundtracks as needed, as well as stamped their work with their own voice and authenticity, and we are all grateful for their results, and in turn have learned from them.
The other opinion I wish to offer is that to just throw a huge list of names and random works from the modern symphonic repertoire to people completely unfamiliar with serious music is not particularly useful. It is like throwing somebody into the ocean without land in sight, without compass or direction. Asking someone to listen to Saariaho and Murail when they have never listened to Debussy or Bartok does answer the question posed, but it is a meaningless exercise.
I'm guessing that Muzicsculp's idea of symphonic music ends with Beethoven or thereabouts and spontaneously begins again with Williams and Zimmer. I would advise that a bridge of sorts be created that will elucidate the connections between modern music's orchestral tools and, moreso, film-music's copies thereof.
Limiting the repertoire to orchestral works, I would say, listen to:
Claude Debussy: La Mer, Iberia, Jeux.
Maurice Ravel (virtually anything however personal favourites include): Le Tombeau de Couperin, Daphnis and Chloe (complete, not the suites), Concerto for Piano N.2.
Igor Stravinsky: The Firebird (Suite if you must but full score much richer), Petrouchka, The Rite of Spring, and for some more austere scoring (with choir - bonus!) Symphony of Psalms.
Sergei Prokofiev: The Buffoon (same as with Firebird), Symphony N.5, Romeo and Juliet (same as with Buffoon), Piano Concerti Nos.2 and 3, Violin Concerto N.1
Bela Bartok: Music for Strings Percussion and Celesta, Piano Concerto N.2, Concerto for Orchestra, The Miraculous Mandarin.
For choir enthusiasts that would like to hear what real writing for voices and orchestra can sound like aside from Carmina Burana, listen to Gustav Mahler's 8th Symphony (Symphony of a Thousand) and Arnold Schoenberg's Gurrelieder.
George Antheil's Ballet Mecanique, Edgar Varese's Ionization, or other works by early modernists can serve as another bridge to composers with different sensibilities and orchestral devices, such as Iannis Xenakis, Gyorgy Ligeti, Krzysztof Penderecki, etc. And only after those we can start discussing Kaija Saariaho, Gerard Grisey, Tristan Murail, Alfred Schnittke, Helmut Lachenmann, etc.
One will achieve and learn NOTHING should one listen to the above works without the corresponding scores!
In addition, the word 'delightful' is not one that springs to mind when considering modern music. However, for the uninitiated that wishes to straightaway hear something "current" that inheres immediate pleasure qualities, I would suggest:
Carl Vine: Piano Concerto, and Symphonies Nos. 3 and 5
Einojuhani Rautavaara: Isle of Bliss, Piano Concerto N.3
Aaron Jay Kernis: Symphony in Waves, Colored Field
Following all this, compare the breadth of indigence and charlatanism of 95% of current film/game/TV music to what you have explored. Do this seriously and no matter how un/talented you are, your work will automatically commence to improve; as if magically...
P.S.: I am not suggesting that film-music should sound like concert music, in fact they should be quite different. However, I am saying that current film-music has ceased for the most part to be informed by its mother (serious music), and has turned to other - base and paralysing - sources (and practitioners) for its inspiration, and the resulting cost has been painfully apparent for many years now.
P.S.2: I am not here to extol modern music. In fact I believe that especially during the last few decades it has plateaued into a sulphurous swamp of cacophony, rehashing the cud of more technical cliches than film and pop musics put together (allowing for some exceptions). In fact, as with Hollywood, everybody thinks that they are a valid composer in this field as well, provided they employ some academically 'acknowledged' techniques (mainly pertaining to 'gestures'). Emetic stuff but that's another thread....