I liked avast better than avg, but it's not as secure as you think.
last time I got a virus, it infected avast's files <_<
had been getting annoyed at it for a bit before that (seriously started taking 30+ mins to download a 2mb update -_-)
just got off avg, trying out avira now (it's pretty smexy so far, but found a virus that avast + avg missed xD)