I'm putting together my first HTPC / Steam box with a Gigabyte GA-Z68MA-D2H-B3 motherboard, Core i5-2500K, Gigabyte Nvidia GTX 660, and 8 GB ram running Windows 7. I'm hooking up the PC via HDMI to an Onkyo 5.1 surround sound receiver that then goes to my tv. What will give me better audio /...