Which Debian distro to try next?

Considering trying the latest build of SimplyMEPIS 3.4-1 and also Kanotix 2005-04 RC 17. Tried Kubuntu 5.10 with KDE 3.4.3 recently, and it works very well. Been hacking at my hybrid Libranet system lately, using Debs from other repositories. Starting to break libraries nicely - will have to do some heavy repair work to get things right or just superimpose another entire infrastructure over it (or back out to the original CDs and move forward from there).