[tor-relays] Relay

I am about to run a relay, but I don't want it using more than 1000GB a month. I prefer to manage this using the *BandwidthRate** *but I don't know the math* *to constrain it over a 1000GB a month. * * I also want to relay the directory. Is there a way to also use vidalia to interface? I'll be relaying on a linux (ubuntu) server remotly, and I'm using a windows system to set it all up. I'll be using SSH to shell in, but I'd love to use vidalia.

Thanks, Jon