Another great usb device is Steve Nugent's USB add on that cuts the 5v connection. Similar to what the TotalDac cable does. I have heard all the connections on my QX5 and for me, ethernet is going to win out. Have to use the USB for now as current server was optimized for this connection. The balanced connection is outstanding if you have that output on server. I heavily isolate my digital gear from electronic to the connection to DAC. Makes a world of difference regardless of what connection you use. So far Audioquest is the most neutral and lowest noise floor cable I've used (Diamond series). I like the Wireworld optical best though.
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Vandy Quatro&s, Laufer DAC/server, AQ cords
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