Question RX 580 Gaming ROG Strix for $189?

That is about right for a 580. Those GPUs have been out for awhile now, but are still decent.

Decent build too. You may want to check the prices of the crucial mx500. It is a good SSD that will perform similar to the 860 EVO but for about $10 more you will get double the capacity.

PCPartPicker part list: https://pcpartpicker.com/list/LLRZ4C
Price breakdown by merchant: https://pcpartpicker.com/list/LLRZ4C/by_merchant/

Storage: Crucial - MX500 500 GB 2.5" Solid State Drive ($69.95 @ Amazon)
Total: $69.95
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2019-03-28 16:07 EDT-0400