Dlink 504T is a good recommendation ( I used to use one a while ago ) and most routers now have SPI ( Stateful Packet Inspection - whitepaper : http://www.cpx.com/whitepapers/Compe...20Firewall.pdf ) Firewalls so they do stop most of the dodgy geezers out there that like to "browse" other peoples computers.
Zak33 loves netgear and a lot of people like their ADSL routers so thats another name to add to the list along with USRobotics.
Hope this helps