I use AVG free because its free, cant buy anything right now. I do want a firewall though, I'm using the generic Windows firewall on my laptop. On my desktop I'm using AVG and Comodo firewall, but I don't really like it. I always liked McAfee better. If I was gonna buy I think it would be that cause thats the one I am more familiar with, so I think you should no only choose on reviews and such, but on which you feel more comfortable using.
// My Blog (yep I started up again) //...etc