I use Tiscali 512Mb for £24.99 per month. They provide a USB modem but I have replaced it with a Netgear DG834G. It is a combination braodband conection, 4 100Mb ethernet ports and a 54Mb wireless link. Very easy to set up and have worked without a hitch for 3 months. I have never even had to reboot the router. My IP address as also not changed for ages so I can access my home network from anywhere in the world.
Mike