I hate to say it, but if you do some searching through advertised sales you can find a newer Sempron or Celeron machine with a DVD burner, 512mb, a 17-in CRT and a bigger HD for $200.
Some manufactures really cut corners by mandating an AOL subscription
, submitting 9 rebates, or having a locked partition to which you have to burn your own reinstall disks. But unless you're system is somewhat current as mainstream, you won't get much for it. I personally wouldn't pay over $100 USD for your setup.