Ghost Minis - no brainer, nothing but good comments.
World Events - Sounds fun, maybe worth having?
Recipes - Sounds fussy. Skip.
Terrain Pack - On the fence. Not sure how much it will add. In other games I find that having -some- terrain elements makes it harder to notice the 2D elements. Not sure if that is true here.
Dark Oak - Must have, must paint. Usable in my D&D Campaign..
Encounter Sheets - We can just print online, right?
Character Sheet - We can just print online, right?
Player Mat - 48 for 4.. Its always a thing to find somewhere to store these things. I have one mat that fits my table, this doesn't seem worth it. Skip.
World Map - too big, skip
Demons and Artifacts - On the fence but KS exclusive so will buy. Heirlooms sound fun. Mini is so-so but price is ok.
Adventure Creation Kit - I want the scenario book but not the kit. $30 is too much for what I want. Skip.
Equipment Pack - Given reviews lamenting the lack in 1E this is a good choice. Should have just made that part of the base game but whatever.