Alienware are good but pricey.
I'd been well out of the PC market for years but I've recently done a few upgrades on my own and completely redone my sons too a few months ago so I did do quite a lot of research quite recently. My knowledge whilst small should be somewhat relevant.
Do you want to build your own?
I'd recommend getting a mid/high end range model/bits. If you're looking to build your own -
GPU - Be looking for a Nvidia 4070 or AMD 7900xt - go a model down on the AMD if you must but don't touch the Nvidia RTX 4060. A lot of prebuilts will still offer the 30 series Nvidia cards and maybe the older AMD ones - don't be fooled by this, they're still charging pretty much what you can get the current gen for. I'd maybe sway on the side of Nvidia for now but they're expensive. Budget at least £500 for one. Spend as much as you can afford on this.
CPU - A decent 6 core or 8 core processor will do. AMD 7600X is decent for the money, Intel equivalent would be the 13600k/13700k for a fair bit more with less performance. - 7600x - £210 - 13600k - £300. *maybe have a look at upgrading if you can stretch the budget, the model numbers increase 600/700/800 etc for both brands. It's easy enough to figure out.
RAM - DDR4 fast or DDR5 - doesn't seem to matter loads at the moment. The faster 32-3600mhz DDR4 stuff is comparable to all but the fastest DDR5 stuff. I'd personally go for DDR5 if I was getting one from scratch though because it'll be more futureproof. That being said, a few quid here and there can soon add up and DDR4 is cheaper on both motherboards and RAM sticks. 32GB DDR 5 - about £100. DDR4 32gb - probably £50.
SSD - you can get a decent 2TB nvme pcie gen 4 for about 80 quid I think.
PSU - As much as you like - i'd recommend getting a 700W gold - probably about £100.
Motherboards - B650 or Z790 - expensive these days - expect around £200
Cases - Whatever you like - probably £100
Cooling - Get a cheaper all-in-one cooler. ID cooling are overlooked and underrated - they do a decent 240 AIO CPU cooler for about £55
Monitor - I highly recommend getting a 144hz 32" ultrawide. There's loads to choose from at the moment but you can get something for £3-400 in that range. If you're into RTS and RPGs, you'll love the width.
--
https://www.awd-it.co.uk/awd-it-x-infin ... aming.html
Something like this might be a good jumping off point. I'd probably upgrade the PSU and the RAM but overall it'll be a decent machine that should be handy for a decent amount of time.
Don't forget as well, buying Dell will mean paying £100 for a Microsoft Windows license you can get for a few quid on key sites.
If I've missed anything ask away.