I wish I had known about NOD32 before I bought McAfee... of course, in those days I still didn't know anything really about any antivirus suites besides Norton and McAfee, so that is why I bought McAfee! It is the best of that very short list!
If you don't want to pay any money for an Antivirus then Avast and AVG are the two best free ones, but I think it is really worth investing in something better.