[Vaderhader]

Here is my all Mech list.

1500 Points

HQ: 142 Commander
142: Shas’O, Missile pod, Plasma rifle, Shield generator, Multi-Tracker, Stimulant Injector

Elite 1: 55 Crisis Battle suit
55 Crisis, Twin Linked Missile Pods, Fusion Blaster

Elite 2: 47 Crisis Battle Suits
47: Crisis, Twin Linked Missile Pods, Flamer

Troop 1: 255 Fire Warriors
130: 12 Fire Warriors, Shas’ui
125: Devilfish, SMS, Targeting Array, Disruption Pod, Decoy Launchers, Multi-Tracker

Troop 2: 255 Fire Warriors
130: 12 Fire Warriors, Shas’ui
125: Devilfish, SMS, Targeting Array, Disruption Pod, Decoy Launchers, Multi-Tracker

Troop 3: 255 Fire Warriors
130: 12 Fire Warriors, Shas’ui
125: Devilfish, SMS, Targeting Array, Disruption Pod, Decoy Launchers, Multi-Tracker

Heavy Support 1: 175 Hammerhead
175: Hammerhead, Burst Cannon, Rail Gun, Disruption Pod, Decoy Launchers, Multi-Tracker, Target Lock

Heavy Support 2: 175 Hammerhead
175: Hammerhead, Burst Cannon, Rail Gun, Disruption Pod, Decoy Launchers, Multi-Tracker, Target Lock

Heavy Support 2: 140 Hammerhead
140: Hammerhead, Burst Cannon, Ion Cannon, Disruption Pod, Decoy Launchers, Multi-Tracker, Target Lock

HQ: 9.4 %
Elites: 6.8 %
Troops: 51 %
Heavy Support: 32.6 %

[Pariah]

No Pathfinders?
I'd drop a Firewarrior squad and take unit of Pathfinders.
Also, the tooled up Dfish are sooo sweet. I used them in my first game with the Tau and they completely dominated. I had three of them cruising and they munched infantry like no one's business.

Besides that great list. I see it being a menace to everything. Though, against heavy tank lists (Guard) I see there being a problem of tank removal.