I want to get a DVD drive for my computer to take advantage of Dolby Digital audio with my speakers (Creative Labs SoundWorks DTT2500). My question is whether to get a DVD drive and a DVD decoder card. I know that my video card (GeForce2 MX) has built in dvd decoding, so video would not be a problem. I was wondering if instead of getting a decoder card if I should just upgrade my soundcard to an SB Live! 5.1 card which has AC-3 (Dolby Digital) output.