What amplifier/speaker system

[Bruciebaby]

Hi guys,
I've put together a HTPC with an asus mother board which has this audio capacity:
High Definition Audio
Enjoy high-end sound system on your PC!
The onboard 8-channel HD audio (High Definition Audio, previously codenamed Azalia) CODEC enables high-quality 192KHz/24-bit audio output, jack-sensing feature, retasking functions and multi-streaming technology that simultaneously sends different audio streams to different destinations. You can now talk to your partners on the headphone while playing a multi-channel network games. All of these are done on one computer.


S/PDIF-out on Back I/O Port
This motherboard provides convenient connectivity to external home theater audio systems via coaxial and optical S/PDIF-out (SONY-PHILIPS Digital Interface) jacks. It allows to transfer digital audio without converting to analog format and keeps the best signal quality.
I would like to complete the build with a 7.1 HD sound system. Any ideas as to what I can do? I'm really just concerned with getting HD sound..is it possible using the s/pdif i/o port?
thanks