Lieutenant + Monster group combo, which should I pick?

By Caporai, in Descent: Journeys in the Dark

Hey guys, first time posting here. :)

I have been playing heroes for a long time but have decided to play as an Overlord for the first time, and I want to try a Lieutenant on the board with the monster, as well as Plot Decks.

I was thinking of grabbing a new Lieutenant Pack. But I'm curious which one I should get.

So far my friend has collected:

Journeys in the Dark

Shadow of Nerkhall

Lair of the Wyrm

Labryrinth of Ruin

The Trollfens

Mists of Bilehall

Baron Zachareth Lieutenant pack.

While I'm going to get:

Crusade of the Forgotten (H&M collection)

Another H&M collection

and 2 Lieutenant pack

Some Lieutenant that I would like to get:

Tristayne Olliven: His "Chaotic Energy" looks powerful but costs with his own health, but in Act2 he gets Soul Siphon that makes his Chaotic Energy use from an adjacent monster health. Combining with a Reanimate monster or Skeleton Archer (both having Reanimation) they will regain their health back when they don't get killed, making Chaotic Energy health cost for free. Also having an undead theme is not bad. :)

Still don't know which way is to play them, bit I would like to hear some opinion, and which Overlord deck I should pick.

Gargan Mirklace: Looking beast and badass. He somewhat feels like a geomancer, considering that he can split the earth and being close to him hurts. Still don't know how to play as an Overlord yet and which monster group should i use when using Gargan. Ynfernal Hulk and Bone Horror might work well when positioning Heroes, forcing them to step into His Aura.

Kyndrithul: Nothing much I can say but he looks interesting to get.

Ardus Ix Erebus: Same as Kyndrithul, but going for Undead theme. Combining him with Medusaes might be interesting to gain Immobilize and Stun, using Hell Hounds is also good just to gain blast.

I cannot come up with more stuff, but I would like to hear your ideas and opinion.