Forgive me, Lion, for I have sinned.
HQ
Tigurius
ELITES
5 Sternguard with Sergeant with Combi-Grav in Razorback with Lascannon and Twin-Linked Plasma Gun
5 Assault Terminators with Thunder Hammers and Storm Shields
TROOPS
10 Tactical Marines with Plasma Gun and Missile Launcher in Rhino
10 Tactical Marines with Plasma Gun and Lascannon in Rhino
FAST ATTACK
Stormtalon Gunship
Stormtalon Gunship
HEAVY SUPPORT
5 Devastators with 4 Plasma Cannons
Vindicator with Legacy of Glory (Battle of Keylek) (An upgrade from War Machines Of The Adeptus Astartes that gives the Demolisher Cannon the Ignores Cover rule for the price of a Rhino - expensive, but very nasty!)
Stormraven Gunship with Hurricane Bolters, Twin-Linked Multi-Melta, and Twin-Linked Assault Cannon
I wanted to bring the Legacy of Glory (Murder) to give the Stormraven Monster Hunter to make it better at hunting that pesky Winged Hive Tyrant, but points and the 1-per-1000pts cap make that impossible.
Other than that, the plan is to pretty much refuse the flank, concentrating the Tacticals, Tigurius and his Sternguard bodyguards and the Vindicator on one side, with the Stormtalons coming in to deliver a powerful blow when the rest of the army gets stuck in and the Stormraven delivering the Terminators into the most troublesome enemy unit or where the power-armoured/mechanised force looks to be struggling.