Where do I go from here?

I notice you are from suburban Detroit. So am I and I am going through a similar journey. Currently have a McIntosh MA 352, Innuos Zenith Mark 3 Streamer, Denafrips DAC, UTurn turntable and both Revival and old Nautilus 804 speakers.  You might already know but we have several brick and mortar audio stores in the area that carry much of the equipment you are thinking about. I have no interest in any of them but I have bought gear from Sound Advantage in Rochester and David Michael Audio in Royal Oak. The Rochester store carries the full McIntosh and B&W lines. The Royal Oak store carries Luxman, Esoteric, Nagra, etc. I have gone to both to do nothing more than listen to and compare gear. They are very accommodating. There are not many places to do that these days but you have two nearby. There also is a nice audio store in Ann Arbor. Hear before you buy.  Good luck. 

Move to Des Moines.

DeKay

Your Macintosh c47 is better than the NAD, keep it, I had the c47. I didn’t use the built in dac because my external dac cost 2x more Than the preamp but I did use the built in phono. When I got rid of my tt/albums I sold the preamp.

A better preamp would be the ps audio bhk pre, no dac, no analog, but sounds very good. You can always do better with an external dac, all dacs inside an integrated are a compromise.

Before you do anything, do you like the warmer sound of the Mac’s? If you do, keep them. If you want to downsize to an integrated at the expense of some quality, look at Hegel for a more neutral sound with a decent built in dac. I’ve owned 2 hegels in the past. Look at the h360 model or more current models.

The weakest piece is your eversolo. For the money it’s ok, but so so on sound quality 

Get the Dual TT if you want to. I have a Dual 721 in the stable and it is a fine turntable, not my best but convenient and adequate for what I ask of it. There are times when the semi auto function comes in handy. The OM 2 Red can be upgraded with an OM 2 Blue stylus when the time comes. Enjoy

I upgraded my 40 year old system a year ago.  I audition several streamer/dac's in my music room after replacing old JSE Infinite Slope speakers with  Klipsch RP-8000F II speakers, my Aragon 4004 Mark II with Musical Fidelity M6si integrated amplifier, and adding an RLS 12S Speedwoofer.  Likewise upgrades of power cables and interconnects, including XLR's.   Among the streamer/dac's I auditioned were Eversolo's DMP-A6 and DMP-A8.  No question about the A8, much better than the A6 and worth twice the price.  And it has room correction software. 

That said, I fully endorse the comments on the importance of the listening space.  My space is 12' x 15' with a ceiling that slopes from 8' up to 22,' where there is an open walkway.   With no room treatment, the echo with just a clap of the hands reverberatedseverely and cautioned against any music played in the room.  I tried nevertheless,  and the clap echo confirmed that listening to music would be intolerable. 

After layering carpet over the entire wood floor and hanging carpets on three walls, the space was entirely transformed, with onlya trace of reverb.  I can eliminate that trace by drawing down the honeycombed 8' shades on the 3 full-length windows/sliders on the fourth wall. 

I say treat your listening space first to see what difference it can make with your current system.   Or if you're keen with anticipation, you could mix variables and treat your space in concert (pun intended) with your component upgrade. 

Enjoy the voyage.