i5 6400+ RX470+ Aftermarket Cooler+ Z motherboard.
RX 470 quite better than 1050 Ti, i5 6400 has 4 cores better than i3 2 cores 4 threads for modern gaming. Even though the GTX 1060 might be 40% faster than RX 470, the cost difference can OC your CPU to at least 4 GHz and also RX can have XFire in the future and your OC CPU can handle it without bottlenecking, unlike GTX where SLI is restricted to only 1060 6GB 1070 or 1080.