For the slackware distro, I've tried zenwalk, wolvix, goblinx, absolute, and vector. I always seem to have problems with vector and absolute, the goblinx installer doesn't set up home partitions, and zenwalk's latest looks like it has some issues. I'm waiting paitently for wolvix to go final as the test releases look wonderful.
I have had the same experience as you with Vector, I haven't tried Abosolute. I couldn't figure out how to install flash on Goblinx. It looks nice though, if that means anything.
1. Wolvix 2.0 B2
2. Ubuntu 9 Jaunty (with Gnome and Kubuntu installed)
3. AntiX 8
4. Mepis 8
5. Zenwalk
6. Slitaz
7. Kongoni - I'm not using it yet but it is looking interesting...