I've got a fairly old build, coming up on four years old. It was a fairly cheap build. Initially it costed under $500, but I skimped out on the cooling so that added probably another $60 in fans, heatsinks, and fan speed controls. Considering its age, I'm considering building a new computer in the future, but this'll do for now.
Case: Gigabyte somethingsomething
CPU: AMD 6000+ Dual Core 3.0GHz
Mobo: ECS A780GM-A Ultra
RAM: OCZ DDR2 800
GPU: nVidia 9800GT 512MB
PSU: 430W Thermaltake
HDD: 320GB
Optical Drive: DVD/CD burner
Fans: 120mm Gelid in the front, 120mm case fan in the back, 80mm Gelid side fan, 120mm Xigmatek attached to the GPU heatsink.
looks dusty... I should clean it soon...