Matrix Quattro DAC...it is simply outstanding and seems to be based upon the Benchmark DAC with some improvements added [and is 1\3 the price]
http://www.head-fi.org/t/564028/matrix-quattro-dac-unboxing-and-initial-impressions#post_7628167
http://www.head-fi.org/t/559794/matrix-quattro-dac-amp