It's always going to be budget driven.
A refurb i5 Dell is the computer equivalent of a used Toyota Corolla. Not the most specialized or exciting thing in the world, but good value and general utility.
If you have a larger budget, 16GB of RAM and a boot SSD are definitely recommended. If you're technical or have a techie friend DIY SSD and RAM upgrades sometimes make more sense than buying the machine fully loaded.
That 2713 should be a nice monitor. I have a Dell 2711 that has only recently been demoted to secondary monitor. I'd recommend connecting to the DisplayPort input.
I picked up an Acer 32" 4K for $300 over the holidays, currently back up to $450. If this got back below $400, it is a pretty nice monitor (colors aren't quite as nice as my U2711 out of the box, need to calibrate it and reevaluate).
https://www.newegg.com/Product/Produ...-158-_-Product
As budget rises, I'd take a look at the 8th Gen i5/i7 CPUs and AMD's higher end Ryzen chips (refresh due in March). The 8th Gen Intel stuff finally goes to 6 physical cores, the AMD chips have 6 or 8 physical cores depending on SKU. RAM prices are pretty out of hand for self builds right now, and I've seen a lot of articles about low stock levels and high prices on mid to high end gaming GPUs due to mining demand. If you're running onboard graphics on the Intel or a low end board on either, you should be fine. I would want at least 2, preferably 3 combined count of Display port or HDMI 2.0 ports