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So this is the list I have been using with a bit of success. What do you guys think? any tweaks or changes you would make?

HQ (115pts)

-Librarian (115pts) Telekinesis
--Epistolary (25pts) (Psyker Mastery Level 2), Force Staff, HQ, Psychic Hood, Relic: The Bones of Osrak (25pts)

Elites (180pts)

-Ironclad Dreadnought (180pts)
--Drop Pod (35pts)
--Power Fist with Heavy Flamer (10pts)
--Seismic Hammer with Meltagun

Troops (694pts)

(x2)-Tactical Squad (160pts)
--Sergeant Bolter
--8x Space Marine Bolters
--Space Marine w/ Lascannon

(x2)-Scout Squad (77pts)
--Scout Sergeant, Sniper Rifle
--Scout with Heavy Bolter
--3x Scout with Sniper Rifle
--Camo Cloaks for Squad (10pts)

(x2)-Scout Squad (110pts)
--Land Speeder Storm-Heavy Flamer
--Scout Sergeant, Bolter
--4x Scout with Bolter

Fast Attack (220pts)

(x2)-Stormtalon Gunship (110pts)

Heavy Support (290pts)

-Centurion Devastator Squad (290pts)
--2x Centurion Warsuit, 2x Missile Launcher, 2x Twin-linked Lascannon
--Centurion Sergeant, Missile Launcher, Omniscope, (Night Vision, Split Fire), Twin-linked Lascannon

(1499pts)

- Set up firebase with Librarian, Tactical squads and Centurion Devastator Squad. Infiltrate Scout Snipers with Heavy bolters into Key spots/Objectives and use scouts in speeders to push others off objectives. Ironclad Dreadnought drops first turn to wreak havok on the enemys back line and on turn 2+ the main use of Stormtalon Gunships are to Mop up infantry squads and take down other flyers.

Our group of players is a few orcs, tau, dark eldar, eldar, chaos and grey knights.

You got lots of ObSec units and okay firepower. I'd try to fit in a TFC to boost your long range anti-horde firepower and improve a ruin's cover save.
Maybe drop 1 tactical, add the TFC and add Skyhammer MLs on your Stormtalons to give them a bit more umph.

My 2 cents, looks decent otherwise.