Comodo Internet Security Pro 2011 - 1 year free
Previous Comodo stuff has been ok (the free firewall), and this gets a good rating from the mag (not that that means much). I'd say worth a shot. This bit is interesting:
'note that this is the full commercial 1-year license of Comodo Internet Security Pro 2011 which ships with a $500 virus-free guarantee for your system, remote security and system support (after registration) through Comodo's GeekBuddy and more!'