I'd honestly try to talk the guy with a 4790k and 970 down to $600 or even $650. 4790k is still about $300 and 16gb of ram is $160+. Not a bad deal as the 970 is great as well for 1080p and you can always upgrade to a 1070/1080 and even possibly a 1080ti in the future and not experience a huge bottleneck.