OK well the time is nearly up for when we can sign up to a new ISP.
As it stands, AOL does appear to be the best unlimited 'non-dodgy' supplier

.
When we signed up to E7even, we were on a 1mb contract as that was the max we could get. However, since then, our exchange has been upgraded to support ADSL Max (quite recent - late march this year). So knowing this, I thought perhaps we could get 2mb now. On the advice of a friend, I went to
www.samknows.com to get an opinion.
However, the results it gave were quite conflicting:

What do you reckon I can get?
By the way, for the record, I tried to work out how much our household uses, but I estimated at least 40gb a month, but more to the point, I really don't like feeling tied down to a usage limit at all.
Thanks for everyone's help!