I got a nice set of Harmon Kardon computer speakers for Christmas. They sound real nice, lack a little bass, but a very crisp sound compared to my 7 year old Son Labs. Question is would a new sound card make my music sound that much nicer, or would it make much difference? Dont use pc for games, more into mp3's. Current card came with pc a couple years ago - creative sound blaster pci. If so what would you recommend?