Server security

Hi,

we are currently working on a project which includes an adult site with about 500 streaming video clips on it.

The user has to pay everytime he orders a movie, therefore we are concerned about the web site's security and possible hacking attacks.

Is anyone of you aware of some product or service in the price range up to $30,000 that offers a higher level of security for web servers than provided by the standard tools?

Thank You,

malte