Bit more of an ouch there. Trust me though, the 7800XT is worth it. Can you get anything other than Sapphire?
Yes, I could.
XFX Radeon RX 7800 XT Speedster Qick319, 16GB, GDDR6, 256-bit, RX-78TQICKF9 - 790
XFX Radeon RX 7800 XT Quicksilver, 16GB, GDDR6, 256-bit, RX-78TMAIRF9 - 861.91
AsRock Radeon RX 7800 XT Challenger OC, 16GB, GDDR6, 256-bit, 90-GA4SZZ-00UANF - 754
AsRock Radeon RX 7800 XT Phantom Gaming OC, 16GB, GDDR6, 256-bit, 90-GA4MZZ-00UANF - 808
(All prices in USD.)
I once read that the XFX is the best in manufacturing AMD GPUs - do not know if this really continues to apply.
4K is good, no debate there. I've been using a 32" TV as a display for years. It does very well. Just make sure you get a screen with 4ms pixel response times and 120hz minimum. My earlier advice is conditional on a desktop use-case-scenario. If you're going to be sitting a few feet away, a 50" would be fine. If on a desktop right up close to your face, 32" really should be the maximum.
I could adapt my gaming room so it could be OK to have a 50 inches. The prices of other options with 4K and 32 inches are very similar to the price of the Smart TV 50" 4K LG UHD ThinQ AI 50UR8750PSA model (the only exception being the Smart TV 32" Toshiba DLED HD - TB020M, but I don't think this is a good model for gaming).
So far:
AMD Ryzen 5 5600X 6-Core - changing to AMD Ryzen 7 5700X3D
Gigabyte A520M DS3H V2 (rev. 1.1) PCI-e 3.0 (8GT/s) - keeping
Rise Mode Air Cooler G800 180mm RGB - keeping
2x Kingston Fury Beast 16GB DDR4 3200MHz XMP 2.0 CL16 - keeping
AMD Radeon RX 7600 Gigabyte Gaming OC 8GB GDDR6 - changing to AMD RX 7800 XT (model in discussion)
Kingston SSD 1TB NV2 M.2 2280 PCIe 4.0 x4 NVMe 3500MB/s - keeping
LG Ultrawide 26" Full HD 2560x1080p 1ms IPS 75Hz AMD Freesync - in discussion
Redragon Superion Mid Tower - keeping
Redragon Anvil Black Speakers / Redragon Medea Black Headset - keeping
Gamemax GX850 850W 80 Plus Gold Full Modular - keeping
Redragon Cobra M711 Model / Knup Gaming PAD GM019 Model - keeping
Redragon Ashe K626 KB-B Model - keeping