Web Filtering Integrated with Active Directory

We are two schools and central office sharing a 100 MB internet connection. We want to be able to filter web content based on AD group.  The two schools are in one forest and the central office has its own forest.  We have looked at OpenDNS's Umbrella Insights (pricey) and are looking for other solutions.  We are currently looking at Websense.

Does anyone have any suggestions on what will work best for us?
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Mohammed KhawajaManager - Infrastructure:  Information TechnologyCommented:
Below are some options:

1. Webmarshal (www.trustwave.com)
2. Wingate (www.qbik.com)
3. Squid - free version (http://certcollection.org/forum/topic/98920-installing-squid-proxy-server-running-on-windows/)
4. EaseGate (www.patronsoft.com)

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