Which one should I get?

[ziegenpeter]

Good day fellow RTS-Fans!
I am new to this forum an not quite sure, if this is the right place to post this question. But anyways... I am very curios about the Men of War series, but I don't know which game I should get. I mean, are the expansions stand alone, if yes, is there anything I would miss?
I don't know if some of guys play heroes of might and magic 5, but the last expansion is a very good example of a stand alone which includes the regular game plus the 1st expansion.
So I hope you guys can help me.
Thank you