If building yourself something like this would fit the bill, although it's an iffy time to buy due to upcoming GPU availability and launches:
My basket at OcUK:
Total: £1,351.87 (includes delivery: £11.98)
Went M-ATX as a personal preference, I find the smaller form factor preferable. You could save £40 and opt for the 7600 instead, the 9700X averages out at a few percent faster, but there is the odd game that sees uplift closer to 20-30%, that said the CPU tends to matter less at higher resolutions such as 4K. As a note, you can find Windows licences for around £10-20, but you can also run without one and only lose minor functionality with the O/S.
You won't be gaming at 8K, but you should be able to run 4K depending on the title, especially with FSR/XeSS upscaling etc. I do find that Nvidia do a better job with upscaling tech in the form of DLSS, I would advise waiting until the 20th and trying your luck at getting the new 5070ti.
That or the new AMD cards which I believe are due sometime in March.