custom build

Mobo: you'd better get P45 chipset instead
GPU: 9500GT is not enough for gaming...
PSU: If you stick to 9500GT, 400-450W should be enough. In case you want to upgrade your video card in future, go for a 500W PSU
 
Maybe 9500GT for light gaming, everything on low at low resolutions. I would say at least a 9600GT or 9600GSO and a 500-550 watt PSU - a named one.
 
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