I currently have a GTX 980, and am looking for an upgrade. The rest of my specs can be found at the bottom. Basically I want to know if it would be better to sell my 980 to get a 1070 or 1080, or just get a second 980. My current monitor is 1440p @ 165hz so I think the extra power would go to good use. I am leaning towards a second 980 since it's cheaper, but am not entirely sure if my 750w GOLD power supply is enough.
http://pcpartpicker.com/list/3cybpb
http://pcpartpicker.com/list/3cybpb