Help me pick a psu 450-550w for gaming

[contego]

Computer details atm:

I have windows 7 64bit,
i5 750 2.6ghz
4gb ram
ace psu 550w 12cm red fan (being replaced)
hd radeon 7800 series 1gb
motherboard is intel DP55WB

will play games like diablo 3 and bf4

 

[AnonymousSurfer]

Here's a nice one I found on Newegg that will have enough power in case you decide to upgrade components in the future.