re: Query: firewalls
The NAT router you'll get will have a decent hardware firewall built in, for extra protection, <a href="http://www.zonelabs.com/store/content/company/products/znalm/comparison.jsp;jsessionid=22qMcVwQm3DG0dCnmUu6nQu3YESZewcRBPTekqjLTO1nBGz45tJk!1843104751!-1062696904!7551!7552!-583988805!-1062696903!7551!7552?lid=home_za>ZoneAlarm, the free version is as good as it gets.
You do have to do some basic configuration, and there is a nag screen, hinting the Pro version is so much better. But the free version will do just fine.
