PlusNet used to have a 100Gb limit, which they have just upgraded to 250Gb. I thought their £19.99 was only for the first three months, but I see that as long as you are in a low cost area, that is the long term price. They do have quite a bit of traffic shaping, but are very open about it on the appropriate web page.
Moved (with trepidation) to BT Infinity 2 for upload speed. Happy BE user for several years.