really...
if you want to tweak it, just switch the 980's for 2xTitan blacks, Same cost and just as effective
Getting the Asus x99 Deluxe or the Rampage V Extreme will be just as viable.
but i DO NOT recommend getting the i7-5960x on any system unless you are trying to show off, for the cost you might aswell go a little further and get a Xeon E502640 v3