Affiliate Network Site with design and upgraded security against XSS

Budget $300 I currently have a Network Affiliate Script and a completed site but had to take it down after an XSS attack. Never made it to launch because I am very concerned about site security. Looking for a programmer to redo the graphic design of front and back end for user friendly interface. Also want the whole software package checked for XSS vulnerability...a must! Willing to consider other software but not looking to buy any more software online. Learned my lesson :-) More details can be provided along with a copy of the script to be used. Thanks!