Higher frequency Ram. Preferably 2133mhz but 1866 will do just fine. That GPU seems a bit expensive because I bought my GPU for $320 and it's the same exact kind so I'd try a MSi 970 4GB card.
What resolution will you be gaming on? If max gaming is 1080p I'd highly recommend not getting the 970 as you can save $300 on a 9602gb which will preform stellar on 1080p.