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I don't play marines but I've collected a small "divergent" ultramarines chapter.  The idea is these pods are dropped onto the planet first.  They disembark, rapid fire one squad into oblivion and then get charged by another.
The army is composed of converted marines w/ nid bits, tyranid hunter metal marines, honor guard sgts and a highly converted terminator chaplain.

Traits:
Trust your Battle Brothers - True Grit + Counter Attack
Cleanse and Purify - Additional Special Weapon
Disadvantages:
Eye to Eye - no landspeeders
Pride in your Colours - no infiltrate or scout

HQ
Chaplain - Term arm, Lightning Claws, Furious Charge
Termie Command - 2 Assault Cannons, Furious
Drop Pod

Codicier - Fear of Darkness, Bolt Pistol, Combat Shield, Melta Bomb
Command Squad - True Grit, Company Banner, 2 Meltaguns
Drop Pod

Elites
Termies - 2 Assault Cannons, Tank Hunter
Drop Pod

Termies - 2 Assault Cannons, Tank Hunter
Drop Pod

Troops
10 man Tac - True Grit, 2 Plasmguns,
Sergeant w/ Terminator Honors Power weapon, True grit
Drop Pod

10 man Tac - True Grit, 2 Plasmguns,
Sergeant w/ Terminator Honors Power weapon, True grit
Drop Pod

<10 man Tac - True Grit, 2 Plasmguns,
Sergeant w/ Terminator Honors Power weapon, True grit
Drop Pod> - this squad fills out the 2k list.

Relying on all assault cannons will make countering even a single Monolith almost impossible for this list. And with the way your podding in I don't think you could afford to ignore it.