You might want to consider an Auzentech X-Plosion soundcard. If you aren't sure about this device

Go ahead and read the reviews on the net so you can understand it better to what's it capable off. Connectivity and features.
I have this soundcard hooked up via optical cable to a Logitech Z5500 atm and it is fine for gaming, movies and music listening in dts. I am planning on building a more flexible multimedia setup upgradeable wise as oppose to the Z5500 and heres a list of equipments i've gotten so far. I'm fairly sure it is almost done and I think this is what your trying to achieve.
Soundcard: Auzentech X-Plosion (Check) Connects to Pioneer using Optical
Reciever: Pioneer VSX-516K (Check) Better than the pod on the Logitech
Sattelites: 5.0 Satellites I nuked from a cheap HTIB (Check)
Subwoofer: SVS PB10-NSD (Check) Will add another PB10-NSD next year.
I hope that gives you a better idea.
Goodluck!