Being a VAR, I sell products from all 3 majors, Norton, McAfee and Trend Micro. It depends on what the client wants. I personally recommend Norton Internet Security. Black Ice from ISS is another good offering.

No matter which software a client goes with, if they are running high-speed in the home or in a small-to-medium sized business, I HIGHLY recommend a hardware firewall such as the Linksys BEF-SX41. Although today's software firewalls are good, by the time they kick in and stop the creepy crawlies, they have already reached your system. A hardware firewall is an extra layer of protection between your system or network and the junk. They are also so inexpensive nowadays that everyone should use one.

I have personally used a Linksys Router and Norton Internet Security on my own systems for some time now and have never experienced any major problems. :)