if all you want to do is setup a firewall check out
other than that it depends on what you want to do w/the distro, i.e. a desktop workstation, or a webserver, or maybe a headless fileserver. really just depends on what you want to do, and how much configuring your willing to do. i like slack, because i'm learning tons configuring it. i also liked mandrake as it had a very easy to configure sys. many folks i've seen posting here are going to fedora the redhat spinoff. hope that sheds some light.