What PSU should i use for my build

fryingpan16

Honorable
Aug 19, 2013
9
0
10,510
My build will be

CPU: Intel Core i7 4770K
GPU: Asus GTX 660 DCU2 2GB
MOBO: Asus Maximus VI Hero
RAM: 8gb Corsair Vengeance
SSD: 120gb Samsung 840 evo
Cooler: Corsair H60 liquid cooler
Case: Fractal Design Define R4

I'm planning to SLI my 660 down the road, will a 600w psu be sufficient or will i need a 750w? Also will a 600w be fine for now while i run a single 660? (If it matters i plan on buying a Corsair PSU to match my build)