Having once owned a DAC-1, I believe it benefits meaningfully from a proper preamp. Whether the Bottlehead Foreplay is the specific preamp that checks the right boxes for you, I couldn't say.
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It will likely be a step down in purity, clarity and transparency despite the tubes in the Foreplay. The upside of a Foreplay will be that the tubes will bring out the 3d aspect of your system and with good tweaking can sound pretty darn clean and halographic as well. The Benchmark should sound fairly neutral otherwise in this set up