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So that just leaves pretty much any DAC made in the last 15 years :) I have had good results from a Gustard item, USB->AES, not really what you want but I think they do budget through to high end without stupid prices. Some secondhand stuff to look for might be a benchmark DAC or even Lavry DA10. Not sure on the prices for those any more. It does depend if you want to spend £50/£500/£5000 though.
Just checked out my list on eBay, looks like prices have picked up on most of those items, I must have bought in a dip.
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I went for @BRM 's Beresford Caiman 2 in the end, the sound improvement through the Headphones is vast.
Yeah, choice is baffling - in this instance this is for the PC/workstation, so reality is primary (but not always) input will be USB and out Headphones. Sources Streaming/CD/Rip etc.