Is it possible to find a good DAC for under $50, 000?

I would like recommendations for a good DAC and streamer.

For someone whose components are around $20k, and speakers are around $50k, what would you recommend for a DAC and streamer (separates or combo)? 
I like to keep the “diminishing return” in mind, and moderate any excessive wishes. So, what DAC and streamer would be proportionate in such a system (described above).

Learning about DACs and streamers is very frustrating.
There are so many unfamiliar terms, formats, combinations, possibilities, etc.!!!

@mitch2 

Thank you for your great response! After dinner i will research your whole list. Eventually I might learn more about DACs and streamers, but I’m just beginning. Last night I did some preliminary searches and made a haphazard list. I will show the list below, but keep in mind, I’m not very confident in knowing much! And the list probably has errors like price, etc. 

DACs
T + A  DAC 200 ● $7200 ● details, organic,smooth, holographic,
Chord Dave  $14G
Weiss tapelike
Bel Canto E1X DAC USA
dcs Lina and clock
EMM Labs DV2 Integrated DAC $30G
EMM Labs DV2 Integrated DAC used, $5G
Meitner M3 Integrated  $10G😃
Weiss Engineering Helios 😃
Accuphase DG-68 digital voicing equalizer.
Lumin P1 $10G
Lumin U2  ● smooth ● $5000
Luman x1 dac/stream● $14G
Eversolo DMP-A6 & A8 Huff recommended 
T + A Preamp, Streaming DAC ● PSD3100 HV
PSA DirectStream DAC MK2 %8G ~~~~?
WADAX Studio Player System $40 G
SACD, DAC, stream, preamp
Eversolo DMP-A8
PlayBack Designs Dream DAC
HiFiRose RS130 Network Transport $52G

PS...The T+ A DAC/Streamer/Preamp was interesting to me. Besides looking nice the combination of components is interesting. I have a lot to study!!!