for a
DoA army you want as many ten man assault squads as possible, groups of 5 dont really last long.
add in a priest with just a jump pack as a force multiplier.
librarian with unleash rage and shield of sanguinius is really effective too. (preffered enemy and 5+ cover save)
i run this list at 1750.
librarian - jump pack, unleash rage, shield of sanguinius
dante
sanguinary guard - banner power fist, infernus pistol
sanguinary guard - power fist infernus pistol
assault squad x10 2 meltas, power fist
assault squad x10 2 meltas, power fist
vanguard x5 jump packs, power fist, power weapon twin lightning claws, 2 x meltabombs.
3 x sanguinary priests - jump pack.
a priest in each assault squad and one with dante and unit of sanguinary guard (banner gives dante high initiative and high attacks, plus 4 attacks from the guard each on the charge)
librarian goes with one of the assault squads.
feel no pain and furious charge across the entire army pretty much, works really well!
also dante and his unit can drop down without scattering and usually pop the enemies best vehicle.
hope this gives you a few ideas