I was looking to get this Sony 5.1 system http/www.amazon.com/Sony-BRAVIA-DAV-DZ… to pair with my pc and my LG http/www.amazon.com/LG-Infinia-42LV540… I have a very capable video card but it only has DVI connections so what sound card should I get to make this work? Also will I need any additional cables or adapters to make this work?