If i have a sound card, the Audigy 2 Platinum. Is it neccesary or practical for that matter, to purchase the "digital dream system" that has the digital decoder or should i just get the 5.1 speakers. I'm not exactly sure if the benefits from the decoder will be noticeable or if i need it with the sounds card i have. Perhaps i could benefit more... im not sure. The site never actually states the price of the decoder system with speakers. Does anyone know how the price of the Digital dream system and just the 5.1 speakers differs. Thanks. Grant