Hey,
My opinion would be to look at the recommend specifications for d2r for example:
Recommended Specifications
Windows® 10
CPU: Intel® Core i5-9600k
CPU: AMD Ryzen 5 2600
GPU: Nvidia GTX 1060
GPU: AMD Radeon RX 5500 XT
RAM: 16GB RAM
Hard Drive Space 30 GB
Resolution 1280 x 720 (or whatever your monitor may be, you can pick up a cheap monitor from ebay or amazon just choose a full HD monitor 27 inch and your good to go, i do not recommend playing on TV due to input lag such as when you click to do a skill, there will be a delay.
Go to either amazon or ebay and look for a "2060 Super" PC or a "2070 Super" PC, i have 2070 Super and it runs loads of games perfectly fine to be honest even at 2k resolution too (as this is my monitor). Get a computer that has DDR4 memory its cheaper than DDR5 will save you money and if you get a FULL HD monitor (1920x1080/1080p) 27 inch or whatever space you can have, the games will run fine on the graphic cards i suggested.

If you are buying from amazon/ebay make sure you ask the seller to stress test the computer for graphic card/hard drive and CPU/RAM, to see if it's in working condition, if you aren't sure regarding what temperatures are normal please do research such as youtube videos for the PC you are buying, if you decide to do the following stress test below it should give feedback for example if a stress test is going well after 30 minutes it's usually fine.
Ask the user for the following stress test:
GPU:
https://benchmark.unigine.com/heaven or GPU:
https://geeks3d.com/furmark/CPU:
https://prime95.net/RAM:
https://www.memtest86.com/Hard Drive:
https://www.seagate.com/gb/en/support/downloads/seatools/ and
https://www.hdsentinel.com/index.phpI genuienly hope this helps.
