Which is the best hardware firewall to protect malacious viruses in Local area Network?

I want to installed hardware firewall between My Internet connection (VSAT satellite) and switch to protect it viruses etc.Pl. inform me which is the best hardware firewall to protect my LAN (also cost of it). I am using NAT in windows 2003 for internet connection to clients.

Which is the best hardware firewall to protect malacious viruses in Local area Network?pop up blocker

....err, a firewall is not hardware

Which is the best hardware firewall to protect malacious viruses in Local area Network?systemworks

Most routers have the NAT firewall.