PSU Bitfinex Prodigy

[pacegod]

Hi All

I'm going to build a pc for my neice for christmas and will build it in a Prodigy.

Need some advice. Pc will not be overlocked and will have the following:
Intel core i3 3225
DVD drive
120gb SSD
1tb hdd
Gigaybyte z77 wifi

I may eventually get her a gpu, but i think the cpu will handle 1680x1050 for now (gw2, wow only)

Will a 400watt psu be enough, if not what about a 500watt. Also does anyone have experience with diff psu's in the Prodigy will a corsair CX400/500 fit or am i better off spending a little extra for the PC power and cooling.

Thanks

 

[pacegod]

Thanks for replies ill check out the silverstone PSU, but it maybe out of my price range, not sure i can go over £60-65.

The HD4000 will run WoW and GW2 fine for her, she's 12, and she'll inherit my old 480 gtx or ill buy her a 650 at some point, but for the meantime it'll be fine, she can lower settings and run at 13666x768 if needed.