I'm looking for a painless solution for the following scenario.

16 PC's available to the general public must have internet access. I've been instructed not to filter content but that traffic should be logged. The logs must be made available in an easy to read format for non-technical management. The location currently has a soho router and an active internet connection.

I could use one of the boxes as a router or proxy but I am trying to avoid this option (I don't want to be over there isntalling updates)

Can anyone suggest a hardware appliance with detailed logging capabilities that comes in under $500? A PC can be setup as a syslog server but I would prefer to have a web interface on the appliance itself. If not what is the best alternative? IPTables,Squid,Winproxy?

Thanks in advance.