Yeah, the more I research Arch the better it seems - especially if I'm trying to keep a minimal install for my ThinkPad. It's not that I run low on system resources, it's just that I like to have as streamlined an install as possible.
I think I tried to install Arch a number of years ago on my Raspberry Pi, but wasn't able to get X to work. I didn't try too hard to get it working as it was just something fun to try to do and life stuff probably happened.
As for Slackware? I liked Slackware when I first started getting into Linux, but it seemed a little long in the tooth last time I tried to use it (maybe about 3 or 4 years ago). It could make for a fun dual boot project though