What draws you to different distros? I get my thrills switching between GNOME and KDE on Debian every now and then ;)
I guess you'll get good at isolating your dotfiles and other configuration tweaks.
I'd want to try out
- Tumbleweed (rolling release SuSE)
- Mint Debian Edition
- Arch, to see what the fuss is about
- NixOS
- Zorin, or another "easy listening" distro