There is no such thing as a mini rca>coax. You will need either the usb connection or a mini toslink>toslink. Make sure that you buy a glass one if you go toslink. Plastic toslink cables suck.
You really ought to move up to 10.6 to try the rest of the players for Mac.
You really ought to move up to 10.6 to try the rest of the players for Mac.