looking for old, dark, classical (w/ a lot of strings, and choral parts)

I need some very strong, heavy, dark classical music with strings. The older the better, and if it has a choir that would be great as well. Stuff that I can put on my ipod, and drive around listening to late at night.
Wagner and Orff.

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Well as far as "dark" and "classical" I have some personal favorites: Berlioz- Symphonie Fantastique, anything by Gustav Mahler. The person above me mentioned Wagner and Orff. Anything by Wagner is pretty good, and Carmina Burana by Orff.
Mozart's requim (the one he wrote right before he died)
Mozart's Don Giovanni
Bach's Tocatta and Fugue in D minor (no vocals or strings, but a cool sounding organ)
The storm during the spring part of Vivaldi's The Four Seasons