HoM&M V Vs. King's Bounty Vs. HoM&M V: Tribes of the East

[CyberGuy]

I recently finished playing the game King's Bounty: The Legend and I loved it. I was not very fond of turn-based strategy game before but now I am hooked on it.
I have to wait a few more months for the translation of Armored Princess so in the mean time I am looking around for similar games and came across the other 2 similar turn-based games called:

Heroes of Might & Magic V and the stand-alone expansion called Heroes of Might & Magic V: Tribes of the East.

Which of the 3 games is the best? I assumed that since this is the King's Bounty forum that it will be biased toward this game.

Should I start playing Heroes of Might & Magic V and Heroes of Might & Magic V: Tribes of the East before the Armored Princess come out in English?