you would benefit much more with coffelake / Ryzen line up, the extra cores will help
i7 8700k + Z370
or
R7 1700 + B350 / X370
the intel definitely won in terms of gaming performance, but also cost a lot more
while the ryzen lose in terms of gaming, it offer more cores/threads, for less buck
pick your poison
PSU is low quality, i suggest u get something like:
Corsair: RMx / TXM
EVGA: G2 / G3 / GS
Seasonic: G / Focus Plus / X
if u want to SLI, opt for 850w++, i wouldn't suggest anything lesser than that, but imho, a single GPU solution is better and more reliable, something like 1080 Ti perhaps
getting the windows 10 is much better, ensuring support on future apps and updates