With a $1K budget:
Shopping Used:
Ayre Codex for just under $1000 (have listened to a lot), and this would be my number 1 pick in your price range.
Bryston BDA-1 for $600 or so (own one, and still a good value at this price point.
Can highly recommend the Chord Qutest (own one), but that DAC goes for around $1400 on the used market.
I'm sure the panel can recommend many others at your price point.
Shopping Used:
Ayre Codex for just under $1000 (have listened to a lot), and this would be my number 1 pick in your price range.
Bryston BDA-1 for $600 or so (own one, and still a good value at this price point.
Can highly recommend the Chord Qutest (own one), but that DAC goes for around $1400 on the used market.
I'm sure the panel can recommend many others at your price point.