'Benchmark DAC1 HDR' functions as a preamp with remote.
'Benchmark DAC1 USB' doesn't.
Hence the choice - 'Benchmark DAC1 HDR' or 'Benchmark DAC1 USB' + Preamp.
'Benchmark DAC1 HDR' = around $1800
'Benchmark DAC1 USB' = around $900 used
So if I get a around 1K preamp that matches it well, both choices are about same price range.