I had a Benchmark DAC1 (w/PCX XLR Mod) and Oppo DV-981HD and they worked well together. All my software has been ripped to an external USB drive for years now and my primary listening is via SB due to convenience, sound quality, hi-res ... 24/96 (now with MW Transporter) ...
If anyone owns a DAC1, get the PCX XLR or RCA MOD. It's a great ROI and the improvement is overwhelming from stock.
Currently using a latest MW Transporter. Just bought a Oppo 83 mainly for BluRay and some SACDs. It's currently at MW for the MOD. My HOPE is after the MOD, it will be a good enough standalone universal player so no need to output the signal to the MW Transporter for audiophile level sound quality.