Depends on how you want to play the game in all honesty. Cryx has many diverse units which means you can aim for a lot of very different forces.
I started with the battle box and used to run a force with quite a few heavy Jacks. I eventually switched from Jack orientated to more 'infantry' type units.
The first thing I did was change my Warcaster to Asphyxious. Definitely my caster of choice. To him, I added a Skarlock and retained two light jacks. The aim is to benefit from the light jack arc nodes and the Skarlock's ability to cast many of Asphyxious' spells. Your opponent has to worry about being hit by spells even when your caster cannot be seen. Plus you have the Skarlock's spells too.
I originally used to run a large unit of Mech Thralls but later changed this to a unit of the Revenant Crew led by Captain Rengrave. Who doesn't like undead Pirates? Yarrrr, avast ye! With the Quartermaster's ability to raise dead crewmen, they can soak up a lot of damage. I would experiment with these larger units to see which suit your style of play.
I never leave the swamp without at least two Pistol Wraiths. These guys are ideal for outflanking your opponent and can whittle down enemy units with ease.
This isn't to say that this is the correct way to play Cryx. The heavy Jacks are bad ass to play and I had a lot of fun beating the crap out of my mates Menoth with some overly violent Jacks.
The best advice is to play a few games and determine what style works best for you. I went through a whole lot of games before settling on the force I run. Its full of character, is unpredictable and great fun to play and this is the best way to play Warmachine.
The oldest and strongest emotion of mankind is fear, and the oldest and strongest kind of fear is fear of the unknown.
Last edited by Logaan; 12-31-13 at 10:47 AM.