How will my rig fare?

[AnyOldName3]

If your planning on doing Nvidia optimised pc games such as battlefield 3 you'll see that a GTX560 will do just as well as a HD6950, but for non Nvidia optimized games the HD6950 will win out. For dolphin they're both on the overkill side as it is far more CPU than GPU heavy, and they are pretty good GPUs.