500 sign-ups needed "US only"

I need 500 sign-ups in a very attractive and useful website that gives its users quick cash advance up to $1500, "US only". INCENTIVE traffic is NOT allowed. Please notice that your are not paid for any traffic outside US or if you drive INCENTIVE traffic. I prefer seeing results of your work before paying you, so I don't like to pay in advance. Bidders who give me the best results are given an additional bonus prize at the end of the project. I want to hear about similar work that you did before as it will give me a better idea about your abilities. My budget is between 400 and 500 $. It is preferred to keep in touch by Yahoo. Your payment is made primarily by AlertPay "You can choose a different method in time". Thanks.