I’ve been in this hobby for 4+ decades, even owned my own shop. I’ve learned to seek out products that fly under the radar, preferring products without dealer markup (sold direct)
Cables WireWorld Series 8, which step below the most expensive is up to you
Everything should be Differentially balanced. After decades of either laziness, or flat out stupidity, both component designers and reviewers are beginning to see the light regarding Dif Balanced
Amp EVS 1200 provides 600 wpc (dual mono). It is based on the latest IcePower class D modules. Mine now has about 100 hours on it. I’ve had all tube systems, hybrid systems, and ss systems. This amp is the real deal, Also GaN amps are amazing, but most are absurdly priced (in a response above $28K GaN amps slashed to $14k. Sounds great, BUT... If you wait ~ 30 days, one is about to be introduced to the market that will shake up the unnecessarily $$$$$ GaN market, including the $14K deep discounted pair.
Preamp: I would go with the Tortuga XLR (~$3K). I don’t own it YET, but, it’s on the list, But for you strongly consider the new Elac Dac/Pre/Streamer a total bargain @ #2499, will save you a ton on cables, power cords, shelving... I am still quite happy with the previous generation DDP-1 + PS 5, which actually retailed for the same $
Power Conditioning:
2 @ 20 amp dedicated lines + Core Tech 1800 + Deep Core
In order, in the last 6 months, I’ve upgraded preamp interconnects, speaker cables, power cords, and digital cables. And most recently the amp. The KCIIs immediately revealed each improvement. After breaking in the EVS 1200, I no longer find the need for my 2 SVS powered subs. Due to their crappy internal XO and volume control they were FAR from seamless. Now, the KCIIs are only good to 42Hz (but the full sound from the EVS 1200 amp is amazing), but I have a large room, and plenty of large scale music where bigger speakers are needed. And so, I am in high anticipation of delivery of Emerald Physics 2.8s, which should arrive by the end of this month . Both have won prestigious awards in their class
Speakers: Again I’ve owned many, both monkey coffins and open baffle. I have owned the Emerald Physic KC IIs (open baffle) for about 2.5 years. They remind me of Magnepans (a good thing)
In your favor, if you act fast, EP has radically reduced their prices
Digital/Steaming/TT there are too many choices, but Jay’s Audio stands out for digital.
As to TTs, that’s a deep dark hole, stick with something basic like a Rega 3-6 and call it a day
hth