I have been using Shaw Secure for quite a while now and it has worked very well for me so far. The new interface makes it much easier to navigate around.
Avira 10 has now been reported as an ad-supported program including a toolbar that requires you change your search provider to ASK.com. If you do not like advertising popups appearing on your screen, please consider a different free antivirus program. Microsoft Security Essentials is one suggestion as it covers spyware also.