https://www.vipreantivirus.com/home-antivirus.aspx Vipre uses Threat Track's own proprietary scanning engine/technology in addition to the Bitdefender engine which has helped it get excellent results in the AV-TEST and AV Comparatives tests.
They have a buy 1 year / get another year for free offer now: http://message.threattrack.com/t?r=...5A58CA9D1B79BCE0B4CD0740F237A06B0A43150A7303& @downloads
VIPRE has a nice discount for all products (for the first year): https://www.vipre.com/products/home-protection/vipre-antivirus-plus/ In addition, if you decide to go for more years, here's a discount coupon which still works: ADDL30OFF