I use Kaspersky Internet Security (reviewed by PC World here) on J's machine (as noted, very few options exist for Win64), and it seems great. I like the fact that it's extremely fast startup, and according to tests low overhead. Certainly better than Norton Internet Security. Anyway! Now Zonealarms is combining Kaspersky AV into their next suite. Zone Alarm has a pretty good IS suite already (see this article), so this will just add punch.

I'll just note that Kaspersky IS was free after rebate when I bought it recently, you need to have a competitors product though. The trick with these IS suites is to keep the packaging/manuals, so you can get a competitive upgrade next year. So you shouldn't ever have to pay full retail; and usually its really really cheap after rebates (ie free or $10 or $20).