I know my GPU would be able to run it at very high, probably, at my intended resolution of 1920 x 1080, but could I run it maxed out in action scenes, with all settings turned up (except maybe AA)?

I am just curious. This card is good enough to run Crysis on Very High at a similar resolution, so I figured it could run The Witcher even better.

You will definitely get well over 100 fps with that card even with AA on, surprisingly the witcher isn't that hardware demanding. Even with all the modding they did to the aurora engine, you can still run it high settings and get decent FPS on a mid range system.

Althou it tends to lag a little during cut scenes and when theres 500 drowners running at you, god i hate drowners.