i7 920, BFG GTX295, 6GB RAM and i'm getting terrible performance.
I'm definitely not buying this.
I have the same system as you more or less except I have a GTX285 and 12GB ram.
I get pretty bad performance as well, feels like I am around 15-20 fps. Someone else mentioned that it might not be that, it might just be that the animations are not fully done so it makes it seem like it is choppier than it is because of the animations?