I'm planning to install a firewall linux box after reading about all its security advantages over windows, but i was wondering, which linux dis would should i use ?

I'm pretty new to the whole linux world, so I don't want something that is going to be to hard to set up, but at the same time i don't want something that is going to be too easy. I'm hoping to use this as a learning expereince too.

Any recommendations or past experiences would be great to hear about.

Also if anyone knows of a good book, e-book, or website with guides to help set up the linux dis that you've recommended i'd very much like to hear.

Thanks alot for any help given.

Oooo .... btw i'll be installing on a P3, 128MB RAM, 8GB H/D, standard grahpics + sound