Our old Compaq is giving us problems and is getting some age on it and starting to think about a replacement. Whats everyones thoughts for a good economy computer? Looked at some HP's at Walmart that were cheap and Staples had a system for $500. Even looked at getting one built locally but $750 for a tower alone is about the going rate. Even thought about ordrering all the stuff and doing it myself but it seems a little intimidating. Any thoughts?