All your specs are good. I wonder why you went for a 2600k when you could have gone for a 2500k which not just cheaper but has par performance with that of a 2600k. 2600k is just 100MHz faster than a 2500k.
Your HD 6790 seems like a bit of a drawback though. You'll be able to play the game at those resolutions probably at very high spec. With DX11 ? Probably at lowered resolution and high spec. There isn't much difference though apart from just killing your FPS.
Overall at DX11, it should play quite well. http://www.youtube.com/watch?v=Yg9ZllRl3F4
Keep in mind that the video above is at 1680X1050, also the CPU is a Athlon X 3.