While I wouldn't go as far as calling Slackware "minimal", you can surely make a minimal install of it. Unchecking X and things that depend on it (KDE, etc.) is a good start. From there you can disable other packages that you'd find redundant, such as the dozen daemons it includes and a bunch of other programs. While this might seem like a hassle to do, I'd definitely prefer that to finding a completely new distro, downloading it, burning it to a CD, installing it and learning/configuring it. I think most distros have the potential to be stripped down and customized.