It's simply impossible to price a computer out without knowing more information.
Keep in mind that the software that the computer comes with will jack up the price BIG time, especially Office XP. The videocard and motherboard are two other big factors, neither of which we know. Does it have a sound card? AMD CPU-Fan, or third-party CPU Fan? Floppy? What kind of Power Supply? What kind of fans? Cables?
There's just way too many variables to make a worthy price check. Sorry! If you can find out any more info, we could nail it easily, but until then it's up in the air.
-Lasereth