Am using ADSL.
You can take any one of over 200 ISPs who supply via BT, and there are also a few ISPs who install their own kit in exchanges, and as you've looked in Samknows you should have the picture of what you can and can't take.
If Easynet have unbundled your exchange you also have the option of the upto 22Mbit from UKOnline as well as Be's service, and there are also as of the end of March options via BT up to 8Mbit.
Check
http://bbs.adslguide.org.uk/ where you can meet a number of Be customers.