lostbears,
The Dac8 is better via AES. I also use Foobar with the DSD plugin, then Fire Wire to a Weiss INT202 interface then AES to the Dac8 this provides me with bit perfect checking and remote volume control. The Dac8 runs direct to the power amps.
This arrangement bettered the USB connection, for me Fidelizer is next and maybe Dirac.