I like BitDefender Linux version and I like AVG Free Linux version. I've got also F-Prot, AntiVir and ClamAV but using all to see if i got a Virus on my Windows Partition (every AV detects other viruses) using an on demand scan (every few months). I got good ratings with BitDefender and AVG Free, and some false positivs using AntiVir.
^ I agree with you AVG anti virus the free one is good enough to protect you in any viruses. As long as you take care your computer and update your anti virus regularly.