Ok i built this computer a few days ago btw on a low budget so dont laugh.
Intel Pentium Dual Core E5400 Stock clocks
4 Gig of ram @ 1333MHZ
Hitachi 500GB 7200 RPM HDD
Asus GTS250 1GB
Asus P5P41T-LE Motherboard ATX
ThermalTake V3 Black Edition Mid Tower
450W PSU - ThermalTake
hmmm, i wont laugh since we both have similar computers, except i have a gtx 460 and a 550 watt psu.
also im a bit worried about your psu, i had a gts 250 and when i tried to OC it it would bsod as well