Just bought Europa Universalis 4 and now downloading. I played the demo and it seemed pretty fun.
I may look into getting Hearts of Iron 3 too in the future too. (Plus, Hearts of Iron 3 is made by the same people who made Europa Universalis IV)
Oh, and also;

My god this game is amazing and i've had it for years now.



(actual gameplay)
plus you can launch atomic bombs into the battlefield