You got that 990x pretty cheap or something? Why not go for the 3rd gen Core i7 Sandy/Ivy instead?
Yes, one of my friends had a 990x sitting in his shop and It was gonna cost me less than a i7 3820 sandy. Also I hear the 3rd gen sandyE really is not a noticable change.
Which like it or not leaves me with more cash in my pocket for cooling and other accessories.