Stop!!
Build your own. I did it with no knowledge. Plenty is sites guide you through it, I bought a computer mag for £5.99 plus postage to Paphos!. Use tomshardware, and if really nervous buy a motherboard with chip and RAM already installed. You will get a machine either 50% cheaper, or 50% more capable.
admittedly, now you’re out the EU it’s expensive to export abroad, but if you are in the U.K., Amazon et Al are cheap as chips!