Is there a benefit from using this with the iMac? I am not sure how the iMacs sound card compares to this one, therefore I would like to know if I should get it since I listen to music a lot. However, most of my music is ripped over iTunes from my CD collections so I do it over 192kB. I know that there are some threads regarding the x-mod but they did not answer my question. It is good according to the reviews, but I would like to know if it would make a positive differance over the iMacs sound card.