Need A Database

hi i need a large databse.. you have to search online and create an excel sheet with the column as described 1.name of company 2.website 3.HR Manager name 4.mailing address 5.phone 6.fax 7.strength of employee 8.email id of hr. i need list of only those companies whose employee strength is more than five hundread..my budget is not high but its huge project...you will have to cover whole eastern part of earth..probably 10-15 countries ...