Here is the list I have currently been running. I love the inclusion of the Orca, that thing is hard to kill and an incredible bullet magnet!

1000 point (999pts)

Warlord (230pts)
Big Bob Watts
Total: 230pts

Tactical Training Advantage (20pts)
Bulls Eyes 1st Marine Battalion
Total: 20pts

Troops (459pts)
9 Light Infantry
Total: 99pts

5 Heavy Infantry
Chainripper bayonets
Total: 150pts

5 Free Marines
M606 LMG
Total: 105pts

5 Free Marines
DPAT-9 RL
Total: 105pts

Support (125pts)
5 Martian Banshees
Medic
Total: 125pts

Light Vehicle (165pts)
Orca battlesuit
Total: 165pts

I'm feeling about done with my Dark Legion army for the moment, so I'm looking into Capitol and found some cool stuff like this list:

1242p/1250p

Warlord:
Big Bob Watts(21st 'Desert Foxes' Recon Batallion)

Troops:
10 Free Marines, 2 LMG
10 Free Marines, 2 RPG
10 Heavy Infantry with Chainripper bayonets

Support:
6 Sea Lions

Light Vehicle:
Orca

The TTA gives all troops and support Camoflage(2), so always -2 to Hit, and -6 if in heavy cover, yes please.

The Sea Lions would flank and hunt lighter targets while the Free Marines and Heavy Infantry blast everything to pieces, the Orca is just there as a bulletmagnet and something the enemy has to take care of.