1080 TI FE not buyable, 1070 TI FE on the rise

[golb]

Thanks so much for the helpful answers!

The GPU topic is probably done for this one now.
So the final rig would look like this:

ASUS X99-E WS/USB 3.1
EVGA SuperNOVA G2 1600 1600W ATX 2.3
Intel Core i7-6800K, 6x 3.40GHz
Samsung SSD 850 EVO 1TB
G.Skill Trident Z black/orange DIMM Kit 32GB, DDR4-3200, CL16-18-18-38
Cooler Master MasterAir Pro 4
2 x Nvidia GeForce GTX 1070 TI FE

Any comments on the rest of the hardware?
Yes, I know the PSU could be platinum certified...
Do I really need 32GB RAM with just 2 GPUs? Is this some suggested RAM?