Content Filtering

in Off-Topic
Anybody able to recommend a good content filtering system (barracuda / cisco asa etc) that gives the ability to easily bypass the filtering based on IP Addressing or computer name etc? Need to be able to quickly give access around filtered sights if necessary.
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Bluecoat and Websense are pretty popular content filters as well. Of course they are pretty costly.
St. Bernard's iPrism works great too.