Need Joomla expert to offer services on as needed basis for web site dev. site in process of dev. -

deadline near. Site is international in scope dealing with large demographich where some individual data will be maintained confidentially. Need advice on plug in which has three chained conditional fields and programming skill to integrate this (proven) plug in  and various plug ins and make recomnedations for best of breed  and also to upgrade site to latest Joomla release.