I've heard many positive things about Archlinux and a friend of mine who used to run Slackware now runs Archlinux and he's very happy, as far as I know. I don't use Archlinux for two reasons: I already know Slackware, and I have also heard, first hand from him, that Archlinux tends to break a bit more than slackware-current, that is, it's a bit more unstable.

But, yes, Archlinux is definitely another distribution that could fit me too, as it's quite simple and doesn't get in the middle. I'll probably try it one day if I become tired of Slackware.