If you hate the blurriness of FXAA, and want to try out some SMAA, I've shown in a video how you can inject it with SweetFX.
On my system, it isn't that much of a performance hit. I wonder if Nvidia's MFAA works with SweetFX SMAA.
If FPS, blurried pixels, stuttering or inpug-lag is a problemn, know that some systems gets a drastic performance hit with following settings:
Resolution scale: Input lag, blurriness
Ambient Occlusion: Heavy impact on FPS at this Alpha stage
Thanks to "Melbo" for this quick info-update on current version.