Migraine today...can't really think. Just looking through some of my PDFs.
That is one of the reasons I enjoy Basic D&D so much.
Everything I want is there, and nothing I don't want. Though there are some things it is "missing" for me.
Thankfully I have the OSR.
Here is my Basic Library books.
These are the core of my current gaming.
Dungeons & Dragons: Basic Set
Dungeons & Dragons: Expert Set
What ever is not covered above I can get from AS&SH. Plus it has a lot of great monsters and a good feel for my games.
Astonishing Swordsmen & Sorcerers of Hyperborea
Various add-ons presents as a "Book 3" or Companion rules.
And some extra spells.
The Witch: A sourcebook for Basic Edition fantasy games
And some books to add bits here and there.
Adventurer Conqueror King System
Adventurer Conqueror King System Player's Companion
Magical Theorems & Dark Pacts
Adventures Dark and Deep Bestiary
All sorts of classes from Barrel Rider Games
And of course a new adventure to take everyone through.
The Shrine of St. Aleena
Ok, so maybe not as simple as I thought.