Discuss your parameters for "Best Antivirus"?
You will find that the free (for now) programs of AVG8, Avast, Avira Antivir are all better than McAfee... protect you sooner, with less problems in daily operations. Also, you need three anti-spyware programs for every antivirus. The best free ones include, but are not limited to, MalwareBytes and SuperAntiSpyware. Windows Defender is another one that is good and becoming better.
Good paid ones I would prefer over McAfee are Kaspersky (terrific), Nod32, and the paid versions of AVG, Avira Antivirus, and Avast.
The free ones are plenty good enough, but do not expect thme to remain free. Avira Antivirus, my current choice will end free versions on July 1, but I will pay for the same version after July 1 as lont as they remaing good.