For 720p i'd go the i5 + RX 570 but change the CPU to an i5 7500, a few extra $ takes you up a good amount of speed. I suggest you check out the Ryzen 1400/1500 too. An RX 570 is easily enough to run most games on High/Ultra in 720p 60 FPS,a GTX 1060 6GB would be slightly overkill and many games would benefit from a stronger CPU especially a quad core and at a lower resolution where CPU scaling in games is higher. Hope this helps
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