Nice system and very interesting thread.
Other DAC's to consider (quite ahead of Benchmark DAC-1 by many opinions):
Lavry Black DA-10 or DA-11 (w/ or w/o USB)
Mytek Stereo96
Weiss (widely regarded as top-notch, $5K)
I have been enjoying the Lavry DA-10 for 1 1/2 years and love it. I sold my $9K CD player....