Sounds like a fun contest!
Would it be cheating to turn the cache file off for FireFox? That CH logo downloades as many times as I use the site in a day could really add up... (to about 1.98MB...)
I can only transfer 20GB a month without extra charges (fiber is a very shared connection, so, downloading a whole bunch of stuff can slow it down for others.. and when you have hundreds of people doing that, it can become a problem, but, it usually never goes below 10MBPS)