Preamp Choice... a hard call for me.

I agree with what some of the others said on keeping the C-41 and adding a DAC.  My only gripe with Mac kit is the light-show (and size in some instances) but the C-41 isn't bad in that respect. 

Your DAC choice should be driven by your requirements: DSD, MQA, USB, multiple coax or optical etc.  Your stance on "golden-ears" and diminishing returns should also be factored in and finally your budget.  I put budget last because I firmly believe there are decent DACs available at many price points. I personally wouldn't spend more than $ 1K on a DAC (prob closer to $500 to be honest) but that is me.

I have been considering the Halo P6 as I want to move from an integrated (Peachtree Nova 150 to seperates). Both devices use the same base DAC so that's not an issue for me but the P6 offers more flexibility than any other preamp that I've come across in my research.  I have to factor in home theatre plus a subwoofer to supplement my LS50s (real estate issues) and the P6 handles all this easily. 

IMHO after spending $ 1-2K on any component more might get you different but not necessarily better.  Let YOUR ears guide YOU.

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!