I have the Logitech Z-5500's. They can be had for cheap on amazon and other online sites. The Z-5500's are AWESOME. For me, they were an upgrade from the Logitech Z-680's (my remote broke after several years). The Z-5500's have the power of the Z-680's, but a much deeper and finer controlled subwoofer.
The Z-5500's take six channel analog input, DD, DTS, LPCM via Coax or Optical, and have a headphone jack on the side (not very powerful for headphones, though). The DAC on teh Z-5500 is actually quite impressive. I have never heard a better sub-$1000 5.1 system (PC or home AV), and the Logitech Z-5500's only cost about $200!!!
One caveat: Logitech customer support is TERRIBLE, awful, insulting, and straight up evil.
Damn them!!! Also, the head units on occasion lock up and you have to power off the system (unplug it or use the switch on the back of the sub). This happens every few weeks or so.
As you can see, I strongly recommend them despite these issues because they honestly sound incredible for the price. I use them for blu-ray and DVD movies, and CD audio.
YMMV.