I wanna buy anti-virus - which is best?

NOD 32 is the best

I use avira personal,it's very good.
And I think it's better than your list.

Nod 32

Nobody's using avast! anti-virus?

I use AVG antivirus and it is really a good antivirus...because of this my Pc is not infected by anyvirus...and it is not heavy to processed by the system.

Avira professional is the best and comodo for firewall.

Im using NOD32

This is a fun tread when you're running linux

+1 for NOD32 if you want to pay

i have used AVG for many years without a problem it does its job and its free