Just keep away from AOL and BT
AOL - just incompatable connect software basicly, Neworking with AOL isn't supported either unless they have changed that, and connecting a console, well just forget about that.
BT - hidden limits, read the small print, plus they keep changing there service to often, I got my 56k and ISDN 64k disconected by BT because of using it too much with a pre pay 24hour connection, they said I used it too much.

one I would use is www.demon.net, the price may not be one of the cheapest but the service is canny.