Transparent Internet Bandwidth / Usage monitoring

I am interested in created an internet bandwidth monitoring system for
non-profit organizations. These organizations range from 10 to 200
users. The system would only be in place for a week at a time, it is
not a long term solution.

It is my understanding that to do this I would need a device that sits
between the internet and my firewall (or a device that is my
firewall).

I thought that a decent linux box with two ethernet cards would be
well suited to this, but I do not know its impact on a number of
issues:

1. Would this computer interfere with routing to internal devices
(both those with dedicated IP addresses and those using NAT)?
2. Would the computer be able to take the load of so much traffic in
addition to monitoring?
3. What software should I use?
4. Is there a simpler, reasonably priced, hardware solution?
5. Is it an unbelievable security risk to place a box unprotected on
the WAN side of my firewall? Can I place a secondary firewall on the
other side?

Thanks in advance.
.

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