Hello, I completed a build about a year ago and received great help from everyone on the site. I am now looking to upgrade my graphics card. Currently running 750ti, i5 4690k, msi X97 pc mate LGA1150 motherboard, and EVGA superNove Nex 650W 80+ gold power supply. My question is should I go with the popular well rated gtx 980ti or the 1070 which I might be able to purchase cheaper or around the same price as a 980ti, would like to spend no more than $450, any input is greatly appreciated, thanks.