There's another tiny reason to choose a X4 970BE over a 955BE or 965BE: power consumption. For whatever reason, the 970BE uses less power at stock, even though it is faster. OC the other two to match it, and the difference will be even greater. Here's just one chart; I think there were others, but I can't find them:
http://www.anandtech.com/bench/CPU/64
There are performance differences, certainly, but any modern CPU can play any game. Yes, you've shown that CPU makes a difference (a lot more than expected in some games), but GPU still generally makes more, and someone willing to lower just a few settings will not experience a decrease in the quality of the game play. With that said, for the same money, I'll take a slower AMD CPU on a full-featured, high quality mobo over a faster Intel CPU on a stripped-down mobo any day.