Here is what I would do for a budget build.
Intel Core i3-3220 -
$129.99
ASRock B75M-DGS -
$54.99
Pareema 8GB (2 x 4GB) 240-Pin DDR3 -
$31.89
Corsair CX430 430W PSU -
$45
PowerColor 7850 1GB -
$169.99
Western Digital 500GB HDD -
$69.99
Antec Gaming Series One Case -
$50
Total =
$551.83
Better gaming CPU and a stronger CPU. This is $20 more than your build and will provide a better gaming experience in everything. If you must have Nvidia I would go with the
650 Ti, subtracting the 7850 that makes the total $541.83. The 650 Ti is about tied with a GTX 560 and uses less power, which is a nice bonus.
If someone wants a quad core you can swap out the i3 3220 for a
Core i5-2310 and the 7850/650 Ti for a
7770. Oddly this quad and lower end vga combo comes out to the almost same total for $551.81 as the other build.
Right now I think that i3 and 7850 will give a better experience compared to a i5 and 7770. When I was testing out two cores compared to 4 cores on my 2500K I was getting about the same performance with some hiccups here and there. Would be great if we could have a processor run down review with PS2 to see where everything lands. Really comes down to what the user wants in the end in terms of their personal needs.
Don't forget chances are someone will need an OS and even a DVD drive, so that another $100-$120 right there.