Internet Sharing and Download Limits

Hi Everyone
*Current Setup*
I have a home network of 2 Desktop Macs, 2 Laptop Macs, and one desktop PC. Currently we all share the internet through an ADSL modem (with built-in wireless router & 4 ethernet ports) which is always running.
*The Problem*
Every month we go over the download limit set by our ISP. We have increased our plan a number of times, but it's now getting to the point that I no longer want to increase the amount I'm paying.
*What I Want*
Basically, I am hoping to setup one of the following two scenarios:
1. the ability to set download limits on the various computers and, once they are reached, to stop that computer's internet access
2. If (1) above is too difficult (or expensive), then the ability to monitor each computer's usage would probably be enough. That way, once its usage is over the limit I wish it to have, then I could manually disconnect it from the network.
I understand that these setups may involve the purchase of additional software and hardware. I would be most interested in what my learned users have to share.
Thanks greatly,
Joe.

These people have what you're looking for... just can't remember which one at the moment!?
http://www.sustworks.com/site/prodipmxoverview.html

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