Building new computers, would like opinions

Hey Guys

Building a few computer systems.

I have put together a list of what I might be looking at, could you guys please let me know what you think about my choices and if there is anything you would suggest I change. For the main-board I was not entirely sure what the differences was between the three that I had picked.

Comp 1 :

CPU : Intel Core i7 6700K
M/B : Asus Maximus VIII Gene or Asus Maximus VIII Hero or Asus Maximus VIII Ranger
RAM : Corsair Vengeance LPX CMK16GX4M2A2133C13R
SSD : Samsung 850 Pro Series 256GB 2.5in SSD
HDD : Western Digital WD Black WD4003FZEX 4TB X2
GPU : ASUS GeForce GTX 980 Strix DirectCU II 4GB
PSU : Seasonic XP-760 Platinum 760W Power Supply V2
COOL: Intel BXTS13X Liquid Cooled Thermal Solution
CASE: Coolermaster CM Storm Stryker


Comp 2 :

CPU : Intel Core i3 4170
M/B : MSI H97M-G43 Motherboard
RAM : Corsair Vengeance CMZ8GX3M2A1600C9 8GB (2x4GB) DDR3
HDD : Western Digital WD Green 2TB WD20EZRX
GPU : ASUS GeForce GTX 750 Ti Strix 2GB
PSU : Seasonic M12II 620W EVO Edition Bronze Power Supply
CASE: CoolerMaster CM690 III Mid Tower Case with Window


Any advice you guys could give me would be great.

Cheers

Nato :)