How much power?

Hardware Hub PSU
1

I've finished my build and am unsure of what psu to get i want it to run quiet and have decided on a corsair rm series but dont know weather to get 550, 650, 750 or even 850w

here is my build 

http://au.pcpartpicker.com/p/2Tujy

2

Could run that on 550, fairly comfortably. Get 600-650 if you want the headroom, which is always advisable. It wouldn't hurt to have more

3

thanks