As Bizman posted, the Intel CPU equipped PC he linked to is a lot better bang for your buck, it has a much better graphics card and it also has both 3.1 and 3.0 USB ports....
The AMD PC will and can definitely do a good job, but there are no 3.1 nor 3.0 USB ports and the RX460 has 2 GB less of dedicated video ram...
The FX4300 AMD CPU is more than capable, the drawback is the RX460 videocard... (maybe you could barter with BestBuy and have them swap out the RX460 for the GTX1050Ti 4 GB graphics card for just a few extra dollars...if so then go with that, if they won't, then try to get the Intel system)
I've been using an AMD FX4350 B.E. quad-core CPU with an AMD R9 270X OCx2 4 GB graphics card and 32 GB of system ram... Most all my sliders are maxed out except environmental set to 1 (I don't like shadows, so I turn them off)
Using the crimson drivers I lock my fps in at 63, I love the layout/options the crimson drivers give you verses the old AMD style...
Using Windows 10, he might need some tips on disabling certain things like telemetry data gathering processes, etc....
Bottom line - both systems will play AH3 just as they are.... But upgrading the graphics card on the AMD PC would be a good option if possible
Hope this helps
TC