Coolermaster 340 case without a PSU (power supply) and a 120mm fan, as it only comes with one and you need a second. Corsair 520 watt PSU Intel E8400 CPU Gigabyte GA-EG41MF-S2H microATX motherboard 4Gb (2 x 2Gb) DDR2 800MHz RAM Nvidia 9800GT Graphics card 500Gb Sata Hard Disk Sata DVD writer/rewriter Keyboard, mouse and monitor operating system
The big one is taking the time to learn how to build it yourself.