What card or interface are you guys using to pump out AC3 digital stream to a 5.1 system? Not looking for the best-est. just want to pump it out of my computer and listen on a consumer system that has optical and coax in. I just want to be able to build a dvd and play the image file and hear the AC3 stream on the consumer system without having to burn a ref and walk over and stick it in the DVD player. I want to see how long i can go without getting out of my chair. Oh, i'm on Mac.