Houstonjazzfan:
The earlier post about the "inferiority" of a Mac's Optical Out connection is not valid in my experience. The individual didn't even realize that numerous companies make very high end Toslink to Mini-Toslink polished glass cables just for Mac usage, so how could they have such an all-encompassing knowledge of that output's "inferiority"?
I've used both Toslink and USB out of my MAC mini, into very high quality DACS. I can tell you that Toslink holds it's own in the better built DACS I've employed.
As usual, opinions vary :)