Is this build good? GPU recommendations (£250–£300 / $315–$380) and possible 1440p gaming

Hi, I’m building my first PC and wanted to get some advice before buying the remaining parts. My goal is to play AAA games like Red Dead Redemption 2, Warzone, and similar titles while producing moderate to high FPS.

Here is my build so far:

CPU: Ryzen 7 5800

Motherboard: MSI B550 (AM4)

PSU: 750W 80+ Gold

Storage: 1TB NVMe SSD

RAM: DDR4 – deciding between 16GB or 32GB depending on budget

GPU: not chosen yet

My GPU budget is around £250–£300 (about $315–$380 USD).

I mainly plan to play at 1080p, but I’m wondering if it would be possible to run some games at 1440p while still getting moderate to high FPS with a GPU in this price range.

Questions:

1.	What GPU would you recommend in the £250–£300 ($315–$380) range?

2.	Would that budget allow for 1440p gaming with decent FPS, or should I stick to 1080p?

3.	Is 16GB DDR4 RAM enough for gaming right now, or should I stretch the budget to 32GB?

4.	Does the overall setup look good, or would you recommend changing anything?

This is my first build so any advice would be appreciated.