Right now, the Wargames are in promotion on Steam. I only have Red Dragon, so I'll only recommend that one since I can't say anything about the other ones. Red Dragon is the best RTS i've played so far. Extremely addicting, and the best part of it is that you can completely make your army the way you would like it to be, and there is only 1 resource in the game, which allows you more to focus on the fighting, rather than focussing on building or gathering the resources. The income is based on the ground you control, which again allows you to focus on the fighting. And best off all: the developers aren't money wolves. Past 2 DLCs have been free and i read the next one will also be free. Only downside i know about the game: It's made by the French, and they pulled their nationalism into the game. The french and Eurocorps in general are overpowered.
Anyway, especially for 20 euro, certainly worth the buy.
Setting: weapons up to 1990, prototypes up to 1995 (prototypes only available to coalition decks or nation decks)
Sides: Blufor (nato) vs Redfor (Eastern block, USSR, NK and China)
Blufor nations: US, UK, Canada, ANZAC, Denmark, Norway, Sweden, W.Germany, France, S. Korea, Japan
Redfor nations: USSR, China, N.Korea, Czechoslowakia, Poland, E.Germany
Next DLC will boost Scandinavian countries.
Edit: I just checked and saw that it's only 1 cent more to have the franchise pack with all 3 wargames, so might be better to buy that one then