I am looking to step in to nicer headphones. I have a pair of Beats Solos that are rather muddy sounding and a gaming headset that sounds tinny. I was looking at the Grado SR-60i, Koss ProDJ 100, Audio Technica ATH-M30, or Sony MDR V6. Are any of these of decent sound quality? I like to game for a long while and listen to mixed music genres. Also, would it be worth getting a sound card, I have mixed feelings about them.