Wait for a recommendation from a "Parent". From your previous post I understand your concern. but is it just that you don`t understand what your kids are doing online? Tell us what your concerns are and we will advise you accordingly.
I trust my kids (three of them) all of whom have unlimited access to the internet (and digital TV come to think of it).
Not one of them have abused the use of the internet, having been told what sites they must not visit. I have two computers, both of which are in an "open access" area (the lounge) so are available for all to see.
I wouldn't like any of them to feel that I don't trust them.
Of course it you put Parental Controls on your computer they may just go somewhere else (a friends house or Internet Cafe) where there are no controls. They may also spread it around that "my mum/dad" doesn't trust me.