I have this old system laying around that I want to sell. AND Sempron 3400+ 1.80 GHz 512MB Ram WD 80GB Sata Nvidia Geforce 6150 LE Sony CDRWDVD Dell Dimension E521 Not much more I can add. Onboard Ethernet and sound. Comes with either Windows XP Home or Ubuntu. Wondering how much you guys think this is worth?