Preamp Choice... a hard call for me.

go backwards...MX-110, has a built in DaC...DIAL AND CONTROLS....HA

 i would be inclined to keep the pre you have and as others have said add a stand alone DAC with features you desire...

capt

’Denon DVD 2900 that has served me well ...’

I felt the same way about my highly modified but ancient Pioneer D 65, stable platter.The laser died. I contacted Pioneer, but  they don’t make parts anymore. I researched what I could afford and came across a Marantz HD CD 1. It blows away the Pioneer. I use it as a transport now using coax cable between it and my Audio Alchemy DAC/Pre.

I owned the Parasound P3 and P5. I hope the P 6 is a huge upgrade

@aberyclark 
 
One thing to take in mind, if still using a pre-amp, then the analog inputs need to be taken into question, as maybe they aren’t clean, so that even the best DAC in the world can’t sound better than the internal DAC was the analog section of the preamp is limiting the quality.

Consider the Sutherland Engineering N1.   https://sutherlandengineering.com/products/n1/
Amazing performance and elegant too!

A couple of DAC's you could consider. At the Budget end the Topping D-50 DAC at around $249. At the upper end the RME ADI-2 DAC. Also has balanced out and has an excellent headphone output. Supports both standard over ear and IEM head phones. Made by RMe a German Pro audio company. $1099