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These Routers will have a easy to use Web Interface and a manual for setup. The Firewall functions can usually be set to default High Level Security to block all uninitiated inbound TCP ports.

I believe this is likely talking about NAT. Helpful, but not the same as a firewall - though manufacturers sometimes don't like to point out the distinction.

NAT is better than a straight Cable Modem access and many Cable/DSL Routers do block inbound TCP ports.

Now days you can buy a middle class router with Stateful Packet Inspection and other true Firewall features for $150.00 or less.

http://www.amazon.com/exec/obidos/tg/detail/-/B00006B9HR/102-6475380-6426540?v=glance

http://www.amazon.com/exec/obidos/ASIN/B00006G2OJ/qid%3D1083621266/sr%3D11-1/ref%3Dsr%5F11%5F1/102-6475380-6426540

http://www.homenethelp.com/web/review/dlink-di-714.asp

Higher end units like the uBr series from Cisco have used Stateful Packet Inspection for awhile.

This is a pretty good solution for $50.00 to $150.00 for a small business or home user.