SECURE Ajax registration module for my Joomla site

I am looking for a SECURE Ajax registration module for my Joomla site. I am using 1.5.14. Besides current joomla registration field I need the following fields: Gender: male or female (required) Age: with dropdown for years only (required) Country of birth: drop down list for all countries (required) Country of current residence: drop down list for all countries (required) Have you applied for immigration to Canada: yes or no (required) Then double captcha words (required) The registration form should be SECURE against any Sql injections and other hacks Max budget $50 I have lot more projects and person who knows Ajax will be a great benefit to my team Thanks