Quick list of what I'd pair with that Ryzen 1600X based on resolution. 21:9 versions I'd use the 144hz recommendations (Ex: 2560x1080P=1660 ti or 2060).
900P/60hz=RX 570 or RX 580
1080P/60hz=GTX 1660
1080P/144hz=1660 ti or 2060
1440P/60hz=2060
1440P/144hz=2070 or 2080/Radeon VII
4K/60hz=2080 (mix of mid to high settings) or 2080 ti (high/ultra settings)
4K/144hz=2080 ti SLI (if positive scaling)