How much is the renewal? Of the commercial (not free) products out there, McAfee's not too bad really imo (there's plenty worse).
Couple of others that are good are ESET (NOD32) -
http://www.eset.co.uk/Home/NOD32-Antivirus and Kaspersky -
http://www.kaspersky.co.uk/anti-virus
Tbh, if you're happy with how to use McAfee and happy with the renewal price, then theres not a lot of reason to change it. Unless you want a free product of course - AVG used to be the best freebie and i'm sure it still does the job but i got sick of the ever-inflating software suite it installs!