Seeking Advice on a PC Build Going from £2000 to £3000

You can find RAM with similar specs around £299.99 from various reputable retailers. It seems like the SSD you initially planned on has spiked in price since it's now out of stock at the original price point you had. Definitely worth keeping an eye out for sales.

The prices on that 2TB SSD are definitely on the higher side especially since it's nearing the end of life. You might want to check out the newer SN5000 and SN5100 models as alternatives. I managed to adjust my build and save around £900 by swapping components around, especially if you go for a cheaper SSD or even a 1TB model and expand later.

I'd personally drop the 2TB SSD. Some users recommend SATA drives for mass storage, which might save you some money. For 1440p gaming, the 5080 might be overkill; consider the 5070 or 9070XT instead, which should still give you great performance without the inflated costs. Also, keep an eye on second hand markets for potential savings on components, especially cases.

Here’s another idea: maybe go with a different case that has better airflow, like a Lian Li model. You’ll benefit from built-in fans and improve thermal performance. Also, consider a single NVMe drive instead of multiple to avoid lane sharing issues that can affect performance. If you can hold out a little longer, prices on RAM and GPUs are expected to drop soon!

Check the benchmarks for the 5090. You'll notice that it sometimes struggles to maintain 144 fps at max settings without upscaling. A solid choice would be to consider a 5070 Ti or 9070 XT for more bang for your buck, particularly since many current games are quite GPU limited at 1440p. With either setup, you’d still be able to reach pretty good frame rates without maxing out your budget.