Looking to get the best out of Redbook Cd listening with Dac a d Transport under 5K?

Suggest the Bryston BCD-3 spinner.  Like you, I have an extensive collection of RedBook classical CCDs, and the BCD -3 works wonders with them. I really have no reason to resort to streaming..
The BCD-3 has a superb transport and an internal DAC that is the guts of the Bryston BDA-3 DAC. 
https://www.hifi-advice.com/blog/review/digital-reviews/cd-player-reviews/bryston-bcd-3-cd-player/

Or, you can get a Bryston BDA-3.14 that has streaming capability built in, and add a Cambridge CD transport. 
Superb DAC + streaming + excellent Redbook CD playback. 

Just a thought.

From The Absolute Sound:  https://www.theabsolutesound.com/articles/bryston-bcd-3-cd-player/

Agree with dbautista about the Cambridge CXC. IMO the newer model might be a better choice.

Prior to getting the BCD-3 spinner, I used the Cambridge CXC with a Cambridge DAC. Not disappointed; however, the current BCD-3 provides better resolution, bass control, upper midrange, and better trebles, particularly in the female voice. Also, using one highly accurate master clock for both the transport and DAC input reduces jitter.
The BCD-3 spinner also has the capability to be used as a transport-only, to feed the digital output to a DAC of your choice.
Both the CXC and BCD-3 have transports specifically made for RedBook 16/44 CDs. The transport for the BCD-3 is made in Austria, and is made from steel, rather than having plastic parts. It is also used in ultra-high performance (and ultra high $$$$$$$) spinners.

I have The CXC on the shelf for a "standby." I do not intend to sell it.