Which antivirus program do you use???

[alansrock]

I currently have Norton as it came free with my PC when we bought it last year, but it will cost $80 to renew it. I got an email from CA saying I could be protected for a mere $20. Money is tight so $20 sounds much better to me, but I don't want to be cheap and then risk my PC security. So what do you use??

ETA:
After searching and searching I went with BitDefender, loved the price and got it for 2-3 PCs with 20% off and this site rated it #1: http://anti-virus-softwareeview.toptenreviews.com/