Well before you pick firewall u need to answer couple of questions....
- What do u use it for?
- Home user?
- Biz how big what apps r u running?
- do you currently own a router?
- have a broadband connection? static IP?
- What ISP do you have ? (I work for Verizon DSL ... infested with viruses)
- What do u expect to gain from AV?
- Norton and others have spyware removal ADWARE is MUCH batter at removing then any AV company.
- How advanced r u in terms of IT?
- Average user would be more then satisfied with home routers like DLINK, NETGEAR, LINKSYS. Rotuers like Netgear have SPI and NAT built in. Linksys WRT54G has 3'd parth firmware that extends the features of the with www.sveasoft.com. Dlink also has several powerful routers with built in FW. It all depends on your requirements. I suspect ur a home user so one of those routers with Adware, AVG or any antivirus program will be more then enough.
p.s. If you are not let me know i will recommend you enterprise firewall/av products