Rough ideas.

I think the best way to collect any army is to do the standard - two units, war machine, character/monster - style of build.  Get a couple of blocks painted, then have some fun personalising a war machine, then reward yourself with a character model.  This also allows you to refine your colour scheme and get-your-eye-in (practice and get comfortable with something, my American friends) as regards the painting style you're going for.  So that's what you can expect, as regards both modelling and painting.  I'll do a unit or two, then something odd and then a character or a monster of some kind.  Following that pattern I hope to end up with at least the following mix of units, and probably more once the ideas start flowing (I have a few but I'll keep them as a reward in case anyone actually reads and follows this thing).  My Chaos Dwarf army will contain at least the following:

Lord on a Great Taurus.
Sorcerer on a Lammasu.
2 Chaos Dwarf Heroes.
2 Socrerers on foot.
A few Hobgoblin characters (no idea how many though).
Chaos Dwarf Warriors.
Blunderbussiers.
1 unit of Immortals (with which I will try something special).
A large horde of Hobgoblins.
Bull Centaurs (again, something cool will have to be done).
Some Minotaurs (how could an army that worships a bull not have some?).
An as yet undecided number of warmachines (but at least half a dozen).
A Chaos giant (because I love the idea of a giant in a dwarf army - or I could get an ogre on a big base and call him a dwarf-giant, but I also like giants so maybe not).
Some orcs (but not run-of-the-mill ones, I have plans in this area).

If I get carried away, I also have my eye on a very special project that I think will be awesome.  Maybe after a couple of months I'll decide to go for it and you'll see what I mean.  If I do, it will be in addition to the $300 budget.

Oh also, if anyone finds this, who also models and collects, then feel free to let me know what projects you're working on and maybe send a few pictures.

Regards to all, as ever.