I second @jasonbourne52 ’s advice to keep the Lux until it dies. If not, another contender is TEAC: their CDPs use excellent transports and any used CDP will work very well as a stand-alone.
BTW, bits may be bits, but extracting them and transporting them correctly has proven a tricky business*; however, spending 4k on a dedicated transport in the age of streaming seems excessive -- you can buy a whole lot of music for that money:)!
*I auditioned the big Metronome transport. It is amazingly better the little Magnat tube CDP I use as transport, but... 40k??? I’ll stream in hi definition instead, download tons of music, buy a mid-priced DAC, and still have money left over for the holidays!😉