Seeking advice building stereo system with Sabrina X

[Blackfield]

tldr; I placed an order on Sabrina X today in Quartz, I was quoted 12 weeks wait time.

Today I auditioned B&W 802 D4 that was paired with McIntosh MC611 and C2700 at BestBuy. The room is very well setup and treated.
The 803 is more appropriate for my room and the price at $20k is comparable to Sabrina X. but my local BB has 802 that shares similar cabinet design with 803 (smaller mid and woofers).
Then I drove to my Wilson Audio dealer while my impression is still fresh to re-auditioned Sabrina X that was paired with Luxman L-590AXII. Here, the room is actually open and not treated.

Some tracks that I used:
1. Luminol - Steven Wilson. This is a busy track that has a lot of things going on, Sabrina X handles it amazingly well, instruments were well separated while I found the 802 were surprisingly sound jumbled up.
802 can go down lower, which is expected, however Sabrina X is no slouch either and I feel - tighter/rounder.

2. Wish you were here - Pink Floyd. I heard some of the acoustic guitar notes on 802 that were sometimes on the far left and center and left again.
I play guitar both acoustic and electric guitar and this bothers me, while in Sabrina, I didn't notice this.

3. Blue Train - John Coltrane. The cymbals sound on 802 was harsh (to me) that during this song I was thinking if I could live with it for long listening session while with Sabrina X, wow, its tweeter is just so sweet to my ear.

4. Both side now - Seal (Joni Mitchell 75th). 802 vocal presentation is much forward thus much closer to the listener vs. Sabrina X. Perhaps 804 is more fully bodied but I prefer Sabrina X presentation.

TBH, I thought it was going to be a tough decision but across above four tracks, I much prefer Sabrina X, YMMV.

Now the hunt for the amp begins, considering:
* McIntosh MC462 and C2700
* McIntosh MA12000
* Luxman L-590AXII - I am suprised 30wpc(8ohms) and 60wpc(4ohms) can power Sabrina X nicely, not sure if the Luxman turns to AB class at higher load.
I forgot to ask the dealer if he put it on 8 or 4 ohms tap.