I haven't brought the Stormraven+
DC+
DC Dreadnought in anything under 1850, but they sure are deadly. I always use a Reclusiarch with the
DC (and have Power Weapons over Power Fists), but my army composition is way different than yours. The
DC Dreadnought with Blood Talons is a terrific answer to Scarabs because with the Stormraven you now have the longer assault range threat, you instagib them in droves, and you'll always strike before them even if they assault you. I would never take Blood Fists over Talons. The rest of your army's lascannons and meltas need to be used for what those fists would otherwise take care of.
I would swap the ABs for a Chaplain and consider dropping the
PF DC to add 3 Power Weapons to the unit. I would use that unit to delete enemy troops off the board with the
DC Dread giving you a solid "bodyguard" of sorts.
I like your list. Definitely a solid base to have fun with. Play that list with confidence and tweak it here and there as you go.