Cost break down of hifi system

If you need a CD transport (no DAC) Audiolab 6000CDT, amazing transport for $600

As others mentioned, It its worth mocking up the system and getting it up/running even if you have to try some loaner library cables from TheCableCo. If you plan to keep the XP12 longer term, while the Cardas Cygnus is not end-game for some Pass amp owners, you could do a lot worse if you must buy cables now. With your current investment, I’d do loaners, and listen for a while. Get a first baseline. Those DA-C 60i speakers have the separate mid and soft dome tweeter, so results really depends on what kind of room your are putting this in, are there soft or hard floors, hard walls, furniture all around or no furniture, reflections?, etc.

Some sources/DACs can be a crapshoot, and can be totally overrated, too costly, imo. Do you have anyone near you to borrow, or buy on on 60-day return policy. What if the system sounds too bright or too soft. Likely more bright with that preamp/amp pairing, however those speakers will soften it some You need that first baseline test to start from - - to figure out where things are "at". Same others are recommending above, otherwise you can get stuck with some stuff you may not want to keep if you go big-bang-all-at-once. Or, unless you want to over spend a lot more $... Reno HiFi knows of the proven stuff and you’ll pay notably more for it.

Room, speakers, network dac, amp, power cables, interconnects.

The better your system is, the more you will need to spend on quality cables to get the best sq you can out of it. If you can’t hear the difference between cables, then what are you doing in this hobby?

Also, if you are building a system for digital streaming, get a good network dac, you can eliminate the preamp and streamer. My network dac is directly connected to my amp (sold my McIntosh preamp and phono preamp when I sold all my analog gear) and my dac is a Roon endpoint. Got rid of my Auralic music server a few years ago.

1) The room

2) Speaker and speaker placement

3) Power

4) IC's

5) Components

The OP is kind “already invested” in the speakers and amp.

I would probably #2 ahead of #1, but that also opens up room correction amps and active speakers.
Active speakers do cut out a large portion of #3, #4, and #5… but that is a bit late now.

I think of cables/interconnects as a more-or-less fixed cost, not as a percentage of the total system cost.  Blue Jeans Cables sells  Canare 4S11 speaker cables, terminated with locking bananas, for $5.90/foot. This might be 10% of a starter system, or less than 1% of your end game system.  

If you think you can hear a difference between the Canare 4S11 and something many times more expensive, well, maybe you can. I suspect all you're really hearing is a difference in gain resulting from a change in length, gauge, or termination quality,  Granted, a system may sound better (not just louder) at higher volumes. Usually, there's an app (or a knob) for that.