Have a HIPRO HP-D250AA0 PSU. Want to upgrade to 400w.

[mashhud1]

Have a HIPRO HP-D250AA0 PSU. I want to upgrade to a 400w PSU at the same dimensions (137mmx128mmx64mm). Please can anybody help me because I can't find any on the whole of the internet!

 

[davcon]

SeaSonic SS-350SFE 350W - 130mm(5.1")*125mm(4.9")*64mm(2.5")
http://www.newegg.com/Product/Product.aspx?Item=N82E16817151063

 

[Dark Lord of Tech]

450W is the best I can locate why 500?

http://www.newegg.com/Product/Product.aspx?Item=N82E16817256063