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Here's a list I came up with for the Sentinels of terra, it has some up sides and down sides. Let me know what you think.

Obviously this is an Imperial fists space marines army

HQ:
Chapter master
on bike with IW and a powerfist

Troops:
(1)Tactical squad in rhino with vet sergeant and meltas
(2)Tactical squad in rhino with vet sergeant and meltas
8 space marine bikes with an MM attack bike

Elites:
3 grav cannon and amp centurions
3 grav cannon and amp centurions
Venerable dread in drop pod with MM and heavy flamer

Heavy:
(1) Devastator squad with 4 rockets
(2) Devastator squad with 4 rockets
(3) Devastator squad with 4 rockets

This uses the sentinels of terra format which allows me to take devastator centurions as elites. It obviously has a lot of shooting and would suffer some against hordes due to the nature of grav cannons.