I have a Chaos Dwarf Army, and have always been unsure of what to take also.
What has more prompted my composition is that I prefer to field a 'counts as' army based on DoW.
I take a Fire Wizard Lord - T4 like Dwarfs
A captain on Pegasus - Dwarf on Bull Taurus
A captain in my Heavy Cav - Bull Centaur hero
Paymaster I just use as a BSB and give him some good weapons...
My Core choices are:
Light Cav - Hobgoblin wolf rider models
Heavy Cav - Bull Centaurs
Duelists - sneaky gitz with 2 hand weapons
My Special Choices are
Dwarfs with Heavy armour, Hand Weapon + Shield
Dwarfs with Heavy armour + GW
A unit of 2 Lead Belchers - converted Chaos Dwarfs with shoulder rockets - modelled with 3 crew (representing the 3 wounds) - have T4 like Dwarfs, S4 like they have been lugging around heavy weapons, and I just don't move them too far to keep them in theme
Ironguts to give a bit more punch to the army offensively - they are just the Dwarf Lords slaves....
My Rare choices are a bit off....
I use a Hot Pot - I know the stats dont match, but it does the damage I think is suited to a burning catapult style contraption - and use goblin crew mainly with a dwarf slaver...
Or a cannon can be used to similar effect, or use Hobgoblin models and a bolt thrower but in gaming terms is a bit more likely to blow up...
I also use the Goblin Hewer as another kind of cool war machine the Chaos Dwarfs invented.
I think it gives a nice mix...
If you like, you can combine the Chaos Dwarf army with DoW as allies, or use a Dwarf army list with some DoW elements.
Either way, I think LeadBelcher models (or rules) are very fluffy, as are having Ogres in the army - as it is mentioned quite a bit in the OK fluff...