My specs
4790k @ 4.4 ghz (pretty much stock)
16gb 1666mhz ram cl7
1tb ssd
2 gtx 970's
I run orbx everything highest resolution
REX highest resolution
water medium setting
cars 25%
carenado tbm 850 or carenado cirrus 22
vatsim
Nomatter what airport I never drop under 20.
Its a darn good system.
If I were you I'd get two GTX980's instead of the Titan Black.
When I added the second 970 I got a 5-7 frame gain. (considering I'll spend 10k to get 5 knots out of my cessna, thats a cheap gain)
I would also stay away from the 6 core processor, its slower than the 4790k at single thread, you won't benefit. I did and I'm happy with my decision.
Now I just need to get a Oculus Rift... (which is what you should get over the 3rd monitor.