I'm putting together a UK gaming PC for around £1300, with a Ryzen 5 7600X, Phantom Spirit cooler, B850 Wi-Fi motherboard, 32GB DDR5-6000 CL30, a 1TB NVMe SSD and a Radeon RX 9060 XT 16GB. I won't be streaming.
I have a 1440p monitor already and might save for an OLED later. Where would you change the parts or spending for modern games? The case and power supply aren't settled yet.
That CPU and 32GB of RAM make sense for a 1440p gaming build. I wouldn't rush to an X3D chip at this budget before checking what a better graphics card would cost. At 1440p, especially with higher settings, the GPU often has more influence on frame rates.
Check the memory price carefully though. The listed kit was nearly £342 in the parts list, which is a lot of the budget for 32GB. Compare other compatible 2 x 16GB DDR5 kits and put any savings towards the GPU or your monitor fund.
The 9060 XT 16GB is a reasonable starting point, but look at game benchmarks before deciding. If you can save longer or find enough room in the budget, the RX 9070 XT is a possible step up. Compare actual UK prices rather than assuming the extra cost is worth it for you.
Nvidia is also worth comparing if DLSS or ray tracing is a priority. The best choice depends on the card prices and the games and settings you care about, not just which brand is on the box.
Don't count on a particular frame rate in every game. A demanding game with ray tracing can behave very differently from one running at high settings without it. Upscaling and turning down a few settings can help, but look for benchmarks that match the resolution and features you plan to use.
I'd also avoid buying around assumptions about GTA 6 performance. Wait for relevant PC benchmarks before treating it as a target.
Before ordering, finish the case and power supply choices and check the complete total. Make sure the case fits the cooler, motherboard and graphics card, and that the power supply has the capacity and connectors required by your chosen GPU.
The built-in Wi-Fi is a sensible choice if running a cable would be awkward. Also consider whether 1TB gives you enough room for your game library. It can fill up quickly with larger games.
If the budget is tight, a cheaper case could free up a little money without changing how the games run. Used parts are another option, but compare the price against new and check the seller's warranty and returns terms before taking the risk.
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plausible+detour_8:
CL30 is nice, but I wouldn't pay a huge premium for it if a cheaper compatible kit frees up useful money elsewhere.