instead of an AMD Phenom II X4 970 (4x3.5GHz) 8MB ...I would be getting an AMD Phenom II X4 960T (4x3.0GHz) 8MB.
I wasn't able to find the exact processors you've mentioned, so I've compared similar processors: http://www.anandtech.com/bench/Product/186?vs=88
You'll notice that there's not too much of a difference, its about 10%. So, it really boils down to whether you want that 10% difference, or technical support.
Bear in mind, though, that while this CPU is good for most modern games, its the GPU that is arguably the more important half of the gaming equation. Its generally good to get a GPU that offers balanced performance in conjunction with your CPU - no point buying a really expensive GPU if your CPU is not up to the task, and vice versa.