I am looking at getting a Home Theatre system/surround sound system for my computer. I think I am going to get one of these three models: the Sony HTDDW900, the Yamaha YHT170S, or the Pioneer HTP-2600. I am leaning toward the Pioneer as its the cheapest of them all and has what I need. What are your guys thoughts on these systems? I was also looking at the Logitech Z-5500. Why is it so expensive? What will I get out of the Logitech that the others will not give me? Also anyone know of a USB or Firewire Coaxial sound card. And I want Coaxial for a reason. Or can I get a optical to Coaxial converter? Thanks.