Hi everyone, I am looking into buying this sound system. http://www.amazon.co.uk/Logitech-X-540-Multimedia-Speaker-System/dp/B000LBHFMO I am aware that I'm going to need an external sound card (I think?) in order to use this. What do you guys recommend I do? This system also has a matrix option. It simulates the 5.1 if you don't have the output required apparently. Do you think it would be worth it if I can't fully utilize the sound system? What do you guys recommend? I really want this, but I need something that will let me plug it all in. Thank you.