My build is as follows:
Asus Maximus VIII Hero
i7-6700K @ OC to 4.5Ghz (socket 1151 - very mild OC)
64GB Corsair DDR4 3200 memory (4x 16GB sticks)
NVidia GTX 970 (major overkill for Rohan but handles Assassins Creed Unity @2560 x 1440 high quality & decent framerates)
1024GB SSD Boot drive, 512GB SSD gaming drive, 4TB Development drive & a few other scattered SSD & HDD for other stuff
NZXT Kraken X60 AIO Liquid cooling with 2x 140mm high static pressure fans
I avoided the socket 2011 chips - I don't need the multithreading of those. Judging from my older i7-3930 system, you should be able to overclock the i7-6800 a fair ways before you end up hitting a brick wall with the heat (they get hella hot once you pass the 4Ghz mark because you have to up the voltage & you got 6 cores belting out the heat).
the 1070/1080 cards are dandy. they are reasonably cool as well. I don't have much data on the newer AMD cards though. I do know over the past couple years they have been falling behind nvidia in performance and heat generation. Who knows maybe AMD turned things around with this release.
don't expect to get more than 20 fps in Rohan though. The frame rate is capped at 20fps. Those that have messed with raising that cap to 40fps ran into kiting issues with ranged classes (all elves can't attack move while attacking)