I'll buy a small server and will install some Ubuntu distro on it, and among other things I'll install a Tor bridge that won't be an exit replay. I also will use it as a SOCKS proxy for a Firefox, I know this doesn't follow best anonimity practices.
Today my relay runs on Windows, as a Tor Expert bundle, executed by Vidalia. Vialia has a chart that shows last minutes traffic usage. Is it possible to config Tor to keep some sort of log about it?