The Smoothwall looks great- does it need an operating system? or is it a stand alone or live CD type of thing.
As for staying with Linux- I installed Unbunu, didn't like it, hacked it, and desided to get rid of it. i tried to install a few other distro's but they refuse to over write unbuntu. So i wiped the drives and the distros still refuse to install! I think the drives might be faulty because i had Win98 on there and .dll's were going missing all the time