I think Ultimate Timeline is the script everyone should have. It’s the one I’d take if I were cast away on a desert island, you know?
But then I also second the Keisei Phonetic-Semantic Composition script, and I would add the Pitch Info script and the Font Randomiser.
Basically, things that add to your learning experience, helping you to draw more connections and broaden your understanding.
I prefer this to the Self Study script, personally, but it’s not as flexible.