I am trying to decide how to buy the best gaming machine. The budget is around $16K. I already have the 4K monitor. Want to run the games on Ultra using the 4K monitor. Should I buy 2 X Titan Z's or quad GTX 980's. Should I wait for the 980's to come out with 8 Gb? I am concerned that the quad 980's won't really be much better than 3 980's and then there is a fps problem.