Those creative cards are for gaming just like it says. Im talking about proper music sound cards.
The cards I suggested are marketed as gaming cards but in my experience with the XFi cards they produce music exceptionally well. But, if you don't need the hoopla or extras, then I might suggest this:
Creative Sound Blaster Z 70SB150200000 5.1 Channels 24-bit PCI Express (x1, x4 or x16) Interface Sound Card - OEM http://www.newegg.com/Product/Product.aspx?Item=N82E16829102054
I have no first hand experience with the ASUS cards, sorry. I have read reviews over the years, and ASUS and Creative seem to be about equal for sound quality- music, movies, and games.