Warmachine Crowd Sourcing

I just finished a minimum unit of Exemplar Errants for my budding PoM force.  The Errants are the first thing I have painted outside of the battle box.  I am going to be looking for bigger battles in the near future as the little battle box games have run their course.  I'm ready to learn how units work and interact with other models on the board.

That's where the crowd sourcing comes in.  I have very limited experience with Warmachine in general and PoM in particular.  I'm going to list what I have and have anyone that actually reads this blog let me know if there is anything absolutely essential that I don't have yet. I've just been buying stuff willy nilly off of eBay. I'd kind of like to focus my spending on what I need. 

I am planning on sticking with pKreoss for a little while longer until I've got him figured out, then I'll probably get into the eFeora that I picked up.  I have a fairly aggressive play style.  I am also a read and react kind of player rather than mapping out everything turns in advance.

Current Holdings:

Casters
pKreoss
eFeora

Jacks
Avatar of Menoth
Crusader
Crusader/Vanquisher/Templar (magnetized heavy jack kit)
Repenter
Revenger

Units
Exemplar Errants - max unit

Solos
Exemplar Errant Senechal
Vassal
Vassal Mechanik


Lost in Postal Limbo
Choir of Menoth
Exemplar Errant UA

Well, drop me a comment if you can offer me some guidance.