Fair enough. The overclockers club only had a regular 660, but the MaxPC had a 580, which I doubt is a bottleneck in most cases.
And in your benches, all scores were over 60fps, so I only see a difference if you have a monitor over 60hz.
That being said, I still would go with the 3570k if I were to build a new system, but that's only because a Microcenter is near me and its only $170 there.