For my 2250 of Dwarves, I did the following:
Battle for Skull Pass
1 extra BfSP Cannon ($5 at my FLGS)
Dwarf Battalion Box
One Sprue of 4 extra Dwarf Warriors direct from GW
King Alrik (Dwarf Lord w/ Shield Bearers)
and a Runesmith
It was all reasonably cheap. I converted Hammerers out of the Great Weapons from Dwarf Warriors and spare hammer heads and banner tops from the same. They look better than the official models.
I ended up with the Dwarf Lord and a bodyguard of 18 Hammerers, a Thane leading 19 Warriors, the Runesmith leading 19 Longbeards, 26 Handgunners, 8 Miners, 2 Cannons, 1 Organ Gun and a Slayer.
It's about 1/2 the cost of any other Warhammer army I've collected (Empire, Orcs, Wood Elves), it looks good and it's a strong list on the table.
Naturally you'll probably adjust the mix to your personal tastes, but you can assemble a mighty throng of Dwarves with minimal expenditure using BfSP as a base.