If I had to source that locally, I know what I'd do and what compromises I'd make, but I don't know how helpful it'd be for you tbh. Still, here's what I'd be looking at:
A cheap, energy efficient 8 core AMD processor with a cheap board (yeah it won't perform as well as an Intel, but should still win in terms of price vs. performance), a relatively energy efficient mid-range graphics card like the GeForce 750 Ti and then a smaller, less expensive power supply since power consumption will be low. 16 GB of RAM and a 1 TB HDD, with some kind of network adapter if needed (if you can do wired, great, if you can't, you'll need a good wireless adapter).
That's almost exactly what I'm running at the moment, in terms of core components, and it makes about 60 FPS easily enough with a fair number of the bells and whistles turned on. I could probably get above 60 so I could wall jump, but I found that personally, I can't stand looking at the game when things like the water effects aren't there.
The main issue with this particular setup is that it's a dead end as far as upgrades go. The power supply will be a limit if you're looking to get a better graphics card or processor, and there are going to be real limits on what you can do with the processor regardless since it's AMD.
