So, I enjoy Paradox games. I have only been playing them for less than a year, but I can see that they are of a good quality. My favourite is Rome, but I also own Crusader Kings and EUIII. CK is okay and I'm still getting my head around EUIII (haven't put enough time in!). I'd like to try out Victoria and Hearts of Iron 2 as I see a lot of talk about them. The problem is that I don't have a very good knowledge of "modern" history (shameful, I know) and I've heard that they are quite complicated. Are they worth getting if I'm not a fan of the respective eras? What should I expect?
Also, I heard that HOI2 - Doomsday was a standalone game and not an expansion, so what are the differences between the two games (HOI2 & Doomsday)?