I'm currently using VirusBarrier as my AV on my MacBook Pro, but the licence is soon to expire and I don't know if it's worth renewing it. I'd like to have an AV on my Mac for peace of mid, but not sure which I should get? Ideally free, but you can say otherwise. I used to use avast! on my Windows machine and it was great and just found out they do an OS X version of it too, but at the same time I've heard that ClamXav is a good AV, also. Which one should I go for? Any others I should consider?