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Well in that case you only have 1 choice - The nvidia soundstorm. Seeing as your SACD is taking up your analog inputs, you will need a sound card that will encode games into a Dolby Digital bitstream in real time. The only sound chipset that I know of that can do this right now is the built-in one on the Nvidia Nforce 1 and 2 motherboard. Other sound cards will have SPDIF out, but this will only pass DD and DTS bitstreams from dvds (or divx movies with AC3 sound). Gaming and music and so on when passed through the SPDIF will be in stereo pcm only.
I doubt there will be an option to remap the channels before encoding to DD, but you never know....
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