Is sufficient, overkill or good for these games. Specifically the GPU. Are these GPUs good to run these games on ultra? If not which GPU would be best. I'm open to two way sli also. Any feedback is appreciated. Thanks!
First, I recommended ASUS mobo for your build to use the 4 way optimization for easy OCing.
2nd, Change the VGA to GTX 760 crossfire it's batter performance than GTX 780 and lower price than GTX 780.
3ed, Memory try to fined lower GAS Latency for fast reading.
Even though your original build didn't have a motherboard, I figured as much. The Asus Z87 Pro includes integrated WiFi and there really isn't going to be any discernible difference in sound quality from the on-board sound and the premium sound card you picked out.