Enough Wattage ?

[DontWorryImNoob]

Hi im building a new pc and im new to all that hardware thing... I just wonder if i will have enough or too much wattage in my new pc 

Parts : 

GPU: MSI GeForce GTX 980 Gaming 4GB PhysX 

Motherboard: MSI Z97 GAMING 5, Socket-1150 

SSD : Kingston SSDNow V300 240GB 2.5" OEM 

HDD : Seagate Barracuda® 2TB

 RAM :HyperX Fury DDR3 1866MHz 16GB Red 

Fan : Corsair SP120 PWM High Pre. Edt. 120mm  x 5

Fan Corsair AF140 Quiet Edt. 140mm Fan

CPU : Intel Core i7-4790K 

CPU Cooler : Corsair H100i Hydro Series CPU Cooler 

Case : NZXT H440 Mid Tower 

CPU paste: Noctua NT-H1 Kølepasta 

 

I want too have enough wattage so i can overclock and mabey even SLI in the future ( Will 1000 Watts be too much for Overclock and sli or to few?)

 

[C0LL0SS0S]

1000W will be more than enough for OC,SLI and other shenanigans

[xQubeZx]

Maybe a little to much, I think you could be fine with 850W beacuse the 980 don't draw that much power. But i dont know how much overclocking will need but i dont think you will need any more than 1000w  atleast