I’d use the Oppo you already have and spend the most you can on a DAC like maybe something like this - used.
https://www.audiogon.com/listings/lis9iie4-schiit-audio-gungnir-da-converters
If you don’t want to use the Oppo then add a Cambridge Audio CXC transport.
https://www.audiogon.com/listings/lis9iie4-schiit-audio-gungnir-da-converters
If you don’t want to use the Oppo then add a Cambridge Audio CXC transport.