I hope Gene chimes in,I just know he has a better way to go.
Chas, I'm afraid I'm going to disappoint ya, because I use Norton's Internet Security 2010.
My renewal is due on Feb 11, so I did some looking around and I think I'm going to stick with it. One of the biggest complaints up until recently was how much system resources that Norton actually uses, and in the last two versions (2009 and 2010) they have done a lot to address those concerns. From the reviews that I have read, they are doing a pretty good job of it. Plus, it consistently gets higher ratings by the reviewers on the sites that I checked (CNET, PCMag, TopTen Reviews).
Norton, Kaspersky, McAfee, and now Webroot all are excellent security packages. They all have their strengths and weaknesses, and some are easier to use than others. None are 100% fool proof, however. I would suggest reading some reviews since you have some time before making your decision. If you decide to go the route of your Internet Service Provider if they offer anything, make sure its the latest version. I'm on Road Runner and they offer the 2007 version of CA Internet Security Suite. With viruses and malware and things being as they are, I think its best to have the latest version of an internet security program that's out there.
I also recommend an Internet Security Suite and not just an anti-virus program. There's more than just viruses floating around out there. Another added layer of security is a router. It will help hide your computer from the internet.