I can't really say - not a big gamer, myself. My guess is a mix of medium and high settings. Don't worry though, besides the 6970 and dual gpu cards (which aren't good values), this system is about as high end as you can get.
Edit: I should say the FPS estimate is at 1080p and with consistently high framerates.
Thanks, you have been real helpful. But I have one last question. I won't have to worry about high temps if I don't overclock right? Will the cooling of the case and fans that come with the cpu and gpu should be adequate enough? Because to be honest I probably won't mess with overclocking as long as my games run fine.