Can anyone tell me about the difference between "HDA Digital X-Plosion 7.1 DTS Connect",,, and "HDA Digital X-Mystique 7.1 Gold/ Dolby Digital Live",,,,,,, from a HTPC sound quality perspective....
Most "older" Cirrus logic DSP driven cards do an excellent job just passing S/PDIF signals through.
You may find e.g. these ones cheap on ebay:
Terratec X-Fire 1024
Hercules Fortissimo
Hercules Game Theater XP
Videologic SonicFury
Voyetra Turtle Beach Santa Cruz