Humble has Crusader Kings 2 plus all of the expansions. It's a huge saving if starting from scratch, or even if you just need a couple of the more expensive expansions.
Wow, look at all those "mixed" reviews at the $15 level. :/
I don't own half the expansions and not sure I care enough to complete the set.
Personally wasn't much a fan of CK2 compared to paradox other historical strategy games.
Victoria 2 got 235 hours so far, and I like it a lot.
EU4 I got 987 hours (99% of that is because of MEIOU mod though) and is my 2nd most played game on steam. Its probably my favorite overall.
Imperator Rome I'm liking a lot despite negative reviews (though I'm on beta patch), and already have 61 hours played and haven't even owned it for 2 weeks
Where as CK2 I only have 86 hours out of and haven't touched it in a long time, nor do I want to or plan to. A lot of people seem to like it, and I DID enjoy my time out of it (till the last 5 hours or so anyway)...but its also the only paradox game I found (for me personally) that runs out of things to do and fast. War is boring and too easy, can't play tall, the RP aspects are better than imperator so it has that going with it (hope they improve that in imperator)...but the thing is...there isn't really much to do except play it as a sims game. Some like that, but not me. By the end of my time with it, I was literally falling asleep as I was playing it lol. Not a good sign for a game.
I think EU4/Vic 2 and hopefully imperator improves more, but I think those 3 are a ton better.
Plus its rare to play a strategy game where you can literally play tall and not forced into expanding into a huge empire and conquering 24/7. EU4/Vic 2 allows you to play relatively peaceful, which again is super rare in a strategy game and my favorite things about them.