Video card: 9600GT (600 like). The price depends on the brand and the market. Generally Shadowchip, seven rainbow are better manufacturers. 9600 is now a better standard configuration of the Internet cafe. Xi'an Internet cafes are mostly GT8 series and GT9 series. So, the 9600GT is basically a game that can be taken loosely.
Hard disk: 320G (340 bucks or so, I just went to Sage two days ago to see). Basically, you can't possibly use to play, what all can be loaded down. Hard disk Seagate and Western Digital is a little better, as long as you do not buy Samsung. Samsung fakes a lot.
Monitor: Liquid display 19-inch 900 dollars can take, but the brand price difference, you can look at the choice.
Motherboard: choose a P43 chip on the line. It may cost 400 bucks.
Other things don't matter, 1G memory DDR2 is only 90 dollars, 2G more than 100. Kingston and ADATA are good. You can look at the situation and choose a 2G or two 1G. optical drive on more than 100 dollars, this is generally not used, just match it. Then if you save space and choose a small chassis, it may take more than 200. The big one is more than 100.
This may be more than 2500 more than the look of more than 3000, the graphics card with a better point. But this configuration generally play a few years no problem. So it's still worth it. If you want to be cheaper, you can consider a smaller hard disk, graphics card to choose a lower, but this configuration is more mainstream.