Dual Graphics isn't worth it imo, gains can be dependant on game/software support and the A8 7600's onboard doesn't have much to offer anyway. A GTX 1050 Ti sounds like a good pairing, depending on what you primarily play and resolution you could consider an RX 580 / GTX 1060 but the A8 7600 could bottleneck it in some modern titles, a GTX 1050 Ti / RX 470 / RX 570 should be a good pairing for the price to minimise the chance of this. Hope this helps!