The pro of slack, is one of the distros that you can install using Floppy (zip-slack), it's sure not heavy (if you install just neccessary). Remember, even if you install slack, and you start to install all the packages from the installation, your pc will blown down. The only thing it's a kinda bad in Slack is hard comparing to other distros.
About gentoo, you can download the minidisk (16MB) and from this disk install gentoo, but how? in the installation you'll install the internet and JUST download the packages that YOU want.
About BSD I don't know too much, I can say it's very stable, once installed it's easier to use him, and to install packages it's easy, because the ports. Look some BSD distros, OpenBSD, NetBSD, FreeBSD. I don't know a lot about their differences, ask vVv.
>>How about SuSE?
Well, If he know's how to install it well, not installing all the packages, that's ok, but I sill think that installing minimal, slack is better.
