@ngiordano at your price point I'd recommend the following options in addition to what others have suggested. Some are over $1000 but you may be able to find them below $1000 used. They all sound different from each other, so it will come down to personal preference.
- Soekris 1421 or 2541 (R2R design)
- RME ADI-2 (AKM-based, DSP)
- Prism Sound Callia (CS4398-based)
- Neko Audio D100 Mk2 (transformer-coupled passive output)
- miniDSP SHD Studio (AKM-based, DSP + Dirac)
- Benchmark DAC2 or DAC3 (ESS-based)