so boxing day is coming up and i have recently realized ive been bottle necking my shure srh840's and my z-2300's. im looking at the Creative Labs X-Fi Xtreme Gamer Fatality Sound Card and the Asus Xonar DX 7.1 Channel PCI Express Sound Card. WHICH IS better? i play games and listen to a lot of music. any help would be appreciated. thank you in advance.