Hello Christian, please also report back with the information you found out. I am also pretty interested, running Tor Exits for various German NGOs this really is a topic I am interested in.
Currently the fastests Exit I operate in Germany is "only" doing a little more than 30MiB/s I think. But it only has 1GBit/s connection and I never bothered about this, as I fear the hoster will terminate the contract if I use all bandwidth.
I guess I would
So however, let us know what you found out.
And make sure, if possible, to come to 36c3 meetup. Thanks yl