I'm no audiophile, but I do appreciate solid audio quality. I have a set of Klipsch THX 2.1 speakers that sound great, but I currently have them connected to my motherboard's internal audio card. Will an upgraded sound card make a big audible difference? If so, could you recommend one that just sounds great- I don't need 7.1 audio or any features at all. Just solid 2.1 audio. Thanks!