Europa Universalis VI
Wait for a steam sale to purchase this game. It comes with a large number of expansions and can get expensive otherwise.
Expansions/DLCS
You can look at the ones I have purchased during sales on the right. I tend to ignore the purely aesthetic ones and focus on ones that add the maximum game value.
Tier I
I'd say these are top tier, must haves
- Rights Of Man
- Queen reagents, monarch traits, great power diplomatic abilities and more.
- Common Sense
- Subject nation interactions make this one a must have.