Please tell us what your case is. Also, you have a monitor, keyboard, and mouse, right?
Here's what I'd go with:Part list permalink
/ Part price breakdown by merchant
/ BenchmarksCPU: Intel Core i3-2120 3.3GHz Dual-Core Processor
($117.99 @ SuperBiiz) Motherboard: ASRock H61ICAFE ATX LGA1155 Motherboard
($72.55 @ Newegg) Memory: G.Skill Value Series 8GB (2 x 4GB) DDR3-1333 Memory
($37.99 @ Newegg) Hard Drive: Samsung Spinpoint F3 500GB 3.5" 7200RPM Internal Hard Drive
($79.93 @ Amazon) Video Card: Gigabyte Radeon HD 6850 1GB Video Card
($129.99 @ Newegg) Power Supply: Antec 550W ATX12V Power Supply
($63.99 @ SuperBiiz) Optical Drive: Asus DRW-24B1ST/BLK/B/AS DVD/CD Writer
($17.99 @ Newegg) Total:
$520.43(Prices include shipping and discounts when available.)(Generated 2012-04-23 22:32 EDT-0400)
Now, I got it as far down as possible. I wouldn't go lower on the GPU. The only thing that's debatable is the motherboard and the PSU... I'm not too sure on the motherboard (I'm sure you could get another one for less. I'm not good with non-overclockable motherboards) and you only need a 407W PSU (meaning 450W or higher). This was a good, reliable one, but I'm sure there are others that are less expensive.