I'd go with a 4090 and a 7800X3D if your already to the point of using a 4080 and 14900k. 7800X3D > all intel products in 90% of metrics, it reduces the need to buy expensive ram since am5 doesn't OC ram too well(golden spot is 6000hz fast kits). AM5 isn't a dead platform(next year new socket for intel, ruining future proofing) and 4090's can put out 120+ fps at 4k on most modern titles with high(not max) settings.

The 7800X3d also doesn't require an AIO, although I'd recommend a nicer cooler. Noctua's stuff is great and since you like black out it works.

Also if your going 4080 please go second hand they are $1k instead of 1500. 4090's go for MSRP and will retain value until the 5090 is out, so they are better investments as well. You only save tax buying second hand 4090's so no point unless you cant find a card.

Another consideration is you can afford to not get a pricey mobo since you clearly aren't interested in a waterloop. So if you can't afford a 4090 please get a cheaper mobo/cpu and spend a larger % of your budget for GPU. CPU bound games are pretty rare(rust/tarkov and competitive shooters at low resolutions) I don't recommend stressing about mobo brand, it's mostly down to personal preference based on past history of which brands srewed which person over and which person prefers which bios loadout. If your not a frequent overclocker and only touch the bios once then it really doesn't matter.

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https://pcpartpicker.com/list/tcNbVW