Power Supply for this build?

[Utilize]

Alright so someone told me that I'd need an 850-1000W power supply for this build:

Motherboard: Z97-E
CPU: i7 4790
RAM: 16GB HyperX Fury
GPU: SLI GTX 970s
SSD: 500GB Samsung 850 EVO
HDD: 1TB Western Digital Caviar Black

Should I go for a 750W, 850W or 1000W power supply?

Thanks!

 

[Onus]

A rig with a single GTX970 can be run on a good 450W PSU. A pair of them will not need more than 750W.

 

[Eximo]

Not a huge price gap between 750 and 850.

EVGA 850W G2 is common recommendation. XFX, Seasonic, Superflower Leadex, Power PC & Cooling Silencer MKII, Corsair AX series