Need Advice on Budget Gaming PC

This system will work for your brother to play the game on but he will be limited as to graphic settings.  
I might consider a slightly larger power supply just to make sure it can handle the video card. I would take advantage of some of the extreme sales going on right now or look on ebay for a psu that is @ least 450w and preferably 500w. Ive seen them pretty cheap. I have a galaxis 650w modular psu 80+ that I found @ pcdirect for $42.99.
I think the Antec will work for you but psu's aren't as efficient when throttled at their upper ranges.
I have this concern because I bought a Sparkle nvidea gt430 for a prebuilt acer not long ago and ended up having to get a larger psu than my 350w that was in it . I just went with a 500 watt to be sure. I got it for $29.99 @ pc.direct as well.

Quote: If you don't have time to do it right the first time..How will you ever find time to go back and fix it?!?!

Also unless your stuck on amd or something, chek out this killer deal on ebay
[/]custom dual core gaming computer 8g ddr3 and nvidea graphics

That PSU is fine. The 5570 use little power. For that budget, I think you system is great enough. But, if you can spend some money, upgrade to at least 5670 or 6670.