I need some suggestions on a GPU for a computer that I plan on selling. Looking for something that would go with this system, not to expensive but something that might make the sale price a bit more attractive. Not sure what that price maybe as of yet. Suggestions? The computer is an i7-6700k, MSI Z270 gaming M5 motherboard, 16mb of DDR4-2133 ram, Phantex eclipse P400 case, Arctic Freeze cpu cooler. The motherboard, case, cpu cooler, EVGA 450 bronze power supply are new. The CPU and ram are recycled from an older computer I had. Thanks TY