I wouldn’t buy any consoles, I would build (though you can buy) a really powerful gaming PC to plug up to my 4k TV. I’ve actually recently done just that and it works amazingly well.
Things to make it a good experience:
Make sure you have a 4k TV with HDMI 2.1 for 120hz gaming
Configure Windows to bypass the login screen on boot
Configure Steam to launch in Big Picture mode on startup
Buy an Xbox Controller and the little dongle for it (it works better than just bluetooth)
Buy a small wireless keyboard with built in trackpad for the odd occasion you need to use a mouse and keyboard (looking at you EA Play).
With that, you’ve got the best console ever. Huge backlog of games, games on steep discounts, a machine that has a much better experience outputting to a 4k TV than something like a Steamdeck or a console. I’ve tried the Steamdeck to a 4k TV and the quality was pretty awful; 720p does not upscale to 4k well at all. And if you wanted to, you could set it up with emulators using retroarch for any games you are missing.
My TVPC specs:
Ryzen 7800x
32GB DDR5-6000
2TB NVME SSD
RTX 4080
Fractal Design Torrent Nano
I picked that case specifically for the huge 180mm fan in the front, the fact it can fit a massive cooler like the Peerless Assassin and the GPU gets fresh air from the bottom. It’s not the smallest case, but it stays cool and super quiet.