After reading the new marine FAQ I have come up with THE LANDRAIDER OF DEATH:
Godhammer Land Raider
Techmarine, servo harness
4 Servo Arm Servitors
Cronos
Lots of points like Lysander and Shrike together but:
It ignores stunned and Shaken
It has BS 5
It can auto repair a gun/imobilised result every turn
The Techmarine and crew can repair from inside the raider making them pretty much invulnerable certainly until the raider is destroyed.
The Techmarine unit has 6 Power fist attacks each turn so would be an effective counter assault unit especially if supporting a unit already in assualt.
If only you could get venerable Landraiders!
Thoughts on this point sink/imovable object?
cheers
Charlie