I administer a small workgroup (10 users or so), and I need a WWW content filtering solution. The network is running Win2K Server in workgroup mode, and I have ISA Server. I need to know the easiest (most affordable) solution. Any ideas would be greatly appreciated.

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MSI 875P NEO-LSR Mainboard - Intel P4C 3.0Ghz (800Mhz FSB) - 2 x OCZ PC4000 512MB DIMMs - 4 x WD800JB 80GB/8MB Cache (RAID 0+1) - SB Audigy Platinum eX - ATi Radeon 9800 Pro AIW - Sony Trinitron 19" - Windows Server 2003 Enterprise