Well here is the dilemma. I am selling this system to my friend which has integrated sound because I never really bothered with sound, 2 speaker system was fine for me. However, he says he will buy it only if I add a sound card capable of supporting a 5.1 Surround System cause he's gonna buy z-640's or something like that for it. Well, I need a sound card that can support it but I don't want to spend too much $$$$$$$$$ because it's not for me. Any advice please?