I really, really like the 15mm Splintered Light figures and they're now available in DB battlepacks for $38 including postage but I'd need to get both sides for any solo games, which makes it as expensive as 28mm in the long run.
With the 30% discount added in, this cost me just over £40, which I think is a bit of a bargain, even if the figures aren't as varied as the Gripping Beast or Musketeer ones. I have no idea when I'll get round to this but at least it's now a viable project for the future.
I may still have a go at 10mm or 15mm, though, perhaps using the new Dux Bellorum rules from Osprey, which are designed for larger scale battles using element based units. I've read a couple of positive reviews and they seem like excellent value for money, as well as being fun to play.